Question: The developer console indicates that  I need to test every if statment in my for loop below.  Can you suggest how to do that?  Thanks in advance for your help!

Code"

@RemoteAction
    global static list <Marketing_Material__c> retrieveAllMaterialsList(String userDivision)
{
    List<String> imgAudience = new List<String> {'AMC', 'WMC'};
    List<String> jnldAudience = new List<String> {'AMC', 'WMC'};
    List<String> jnlAudience = new List<String> {'AMC', 'WMC'};
    List<String> jnldgAudience = new List<String> {'AMC', 'WMC'};
    List<String> rbdAudience = new List<String> {'AMC', 'WMC'};
    List<String> cclAudience = new List<String> {'CURIAN', 'CURIAN RIA', 'CURIAN SELECT'};
    List<String> siiAudience = new List<String> {'NPH'};
    List<String> npcAudience = new List<String> {'NPH'};
    List<String> icaAudience = new List<String> {'NPH'};
    List<String> investAudience = new List<String> {'NPH'};
    List<String> wAudience = new List<String> {'NPH'};
    Map<String, List<String>> audienceMap = new Map<String, List<String>>();
   
    audienceMap.put('IMG', imgAudience);
    audienceMap.put('JNLD', jnldAudience);
    audienceMap.put('JNL', jnlAudience);
    audienceMap.put('JNLDG', jnldgAudience);
    audienceMap.put('RBD', rbdAudience);
    audienceMap.put('CCL', cclAudience);
    audienceMap.put('SII', siiAudience);
    audienceMap.put('NPC', npcAudience);
    audienceMap.put('ICA', icaAudience);
    audienceMap.put('INVEST', investAudience);
    audienceMap.put('W1', wAudience);

     List <String> finalAudienceListB = new List <String> (audienceMap.get(userDivision)); //e.g. 'WMC, AMC'
     audienceMap.clear();

     Map <Id, Marketing_Material__c> materialListC = new Map <Id, Marketing_Material__c> ();
     List <Marketing_Material__c> finalMaterialList = new List <Marketing_Material__c> ();
     try
     {
         for (Marketing_Material__c mmmm: [SELECT Name, Marketing_Material_Name__c, Form_Number__c, PieceLink__c, PictureLink__c, Approved_Firms__c, Not_Approved_Firms__c, Approved_States__c, Not_Approved_States__c, Item_Cost__c, Audience__c, Product_Line__c, Audience_Groups_Multi_picklist__c, IsObsoleted__c FROM Marketing_Material__c WHERE IsObsoleted__c = false AND(Viewabillity__c = 'Viewable And Orderable' OR Viewabillity__c = 'Viewable Not Orderable')])
         {
             String audC = mmmm.Audience_Groups_Multi_picklist__c; //e.g. 'WMC, AMC, SSU'
             if (!String.isBlank(audC))
             {
                 Integer audienceMatchesC = 0;
                 for (String tt: finalAudienceListB)
                 {
                     //you're finding a matching in the Audience_Groups_Multi_picklist__c(aud) with each item the user is qualified to see based on the user division in the
                     //above hard-coded map.
                     audienceMatchesC = audienceMatchesC + audC.countMatches(tt);
                 }
                 if (audienceMatchesC > 0) //if there's a match then we're good to return the record for the user to see
                 {
                     materialListC.put(mmmm.Id, mmmm); //we add to a map which, by default, prevents duplicates from being added;
                 }
             }
         }
         finalMaterialList = materialListC.values();
     }
     catch (Exception e)
     {
         ApexPages.addMessages(e);
     }
     return finalMaterialList;
}