Suppose a phone number, stored as a ten-character string (of digits only) called phoneNumber, must be converted into a string that has parentheses around the area code. Which statement will do that?

The correct answer demonstrates the proper way to format a ten-character phone number string by including parentheses around the area code. The phone number is structured as follows: the first three characters represent the area code, followed by the next three digits, and then the last four digits.

In the correct statement, the substring method is used to extract the area code from the original phoneNumber. The call to phoneNumber.substring(0, 3) retrieves the first three digits, which constitute the area code. By placing this substring within parentheses with the syntax "(" + ... + ")", it formats the area code correctly.

The subsequent part of the statement, + phoneNumber.substring(3, 10), appends the remainder of the phone number starting from the fourth character (index 3) to the end of the string. This includes the three digits following the area code and the last four digits, completing the phone number format.

This approach ensures that the area code is properly enclosed in parentheses while maintaining the integrity of the complete phone number. The correct execution of these methods reflects proper understanding of string manipulation in programming.