java - Why does this code not return just "S" but instead the whole String MINUS the "S" -

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I am new to APCS and I am practicing for my test. After analyzing this code with step-by-step analysis, I believe the answer is not listed below, but instead it is "S". However, my teacher says that the answer is "D"

< P> Can you explain this question to me?

Looking at the following method: 

  public static string WhatsUp (string str1, string strings 2) {int index = straw.andexoff (straw2); If (index! = -1) str1 = str1.substring (0, index) + str1.substring (index + str2.length ()); Return str1; }

What is this line of code output? 

  System.out.print (WhatsUp ("SpongeBobSquarePants", "S"));   
  
  
  
  
  
  
 P> 
 (E) Patrick   
 
 
  index index = str1.indexOf (Str2);  
 
 Index is set to 0 
 
  str1.substring (0, index)  
 
 This returns nothing (Index is zero, ending point is exclusive (not included) 
 
  public string object (int startIndex, int and index)  
 
 
 a new String gives a substring of this string. The start of the  object starts with the alphabet specified on the index and index-1.  Thus, By and Index -andex. 
 
 
  + str1.substring (index + str2.length ());  
 
 This position is 1 Returns everything 
 
  return str1;  
 
 answer is

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