A variable's value

• A. changes when necessary
• B. must never change
• C. is always zero
• D. is predetermined at compile time

Answer: (A)

Variables represent storage that can hold data and be updated during program execution. They change when necessary because the program assigns new values, processes input, or computes results. This flexibility lets you track changing information like a counter or a user-entered value. It wouldn’t fit to say they must never change—that would describe a constant—or that they are always zero, which isn’t true for typical programs. It also isn’t about values predetermined at compile time, which describes constants or literals. The defining idea is that a variable’s value can be updated as the program runs.