How Many String Objects Are Instantiated by the Following Code

Multiple Choice

How many String objects are instantiated by the following code segment (not including the literals) ?
String s1,output;
S1 = "hello";
Output = "\nThe string reversed is: " ;
For (int i = s1.length() - 1;i >= 0;i--)
Output += s1.charAt(i) + " " ;

A) 1.
B) 4.
C) 5.
D) 7.