The instruction that should replace /* missing code */ so that the method countA works as intended is (e) str = str.substring(pos+1);
<h3>Methods</h3>
The program is an illustration of methods (or functions)
Methods are blocks of program statements that are executed when called or evoked
For the method to return the number of character A in a string, the loop body must check if the current character is A.
This is done using the substring method of a string
The syntax of this is: str.substring(pos + 1).
Where str represents the string, and pos + 1 represents the character index
Hence, the missing instruction is str = str.substring(pos+1);
Read more about methods at:
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