How can I get my sound array working here?

Here is my code.

I'm trying to figure out why my PlaySound(#); functions work when they are in the "Pick Up" compare tag IF statement, but they don't work when the PlaySound(#); function is placed in the "Finish" IF statement.

I tested the sound files and its not the file.

Any ideas? Thank you. I'm somewhat a beginner, so please offer a more elaborate answer if you can. Thank you.

public void OnTriggerEnter2D (Collider2D other) {

     // Picks up gameObjects which are tagged with "Pick Up" and adds one to the player's score. 
     if (other.gameObject.CompareTag ("Pick Up"))
     {
         other.gameObject.SetActive (false);
         Debug.Log("YOU GOT A STICKER");
         PlaySound (0);
         score = score + 1;
         setScoreText();

     }

     //Reduce health points if enemy is hit and game over if it hits 0 health points
     if (other.gameObject.CompareTag ("Enemy"))
     {
         Debug.Log ("Enemy hit");
         PlaySound (1);
         score = score - 1;

         if(score <= 0)
         {
             score = 0;
         }
         other.gameObject.SetActive (false);
         setScoreText();
     }

     if(other.gameObject.CompareTag ("Finish"))
     {
         Debug.Log("FinishLine");

         if(score >=5)
         {
             PlaySound(3);
             Debug.Log("score is 5 or above");
         }
         else if(score >=2 && score < 5)
         {
             PlaySound(4);
             Debug.Log("score is below 5");
         }
     }

void PlaySound(int clip) { AudioSource audio = GetComponent(); audio.clip = audioClip[clip]; audio.Play (); }