What is the AP standard for the use of apostrophes with numbers and individual letters?

Question

Quizplus · Accepted Answer

The AP standard does not recommend the use of apostrophes with numbers or individual letters unless there is a possessive or a contraction that requires it. The only exception is the letter A when it is used as a word (e.g. "A's and B's" for grades). Therefore, option B is the correct answer as it aligns with the AP standard.

What Is the AP Standard for the Use of Apostrophes