Answer:
The answer is "letter_Grade".
Step-by-step explanation:
In the given question, the first choice "letter_Grade" is correct because it is a descriptive variable, which is used for holding the string value, and the wrong choice can be defined as follows:
- In the second and third choice, it is wrong because it is not descriptive.
- In the fourth choice, it is wrong because it uses a number that is not allowed.