In Each Set Below, Choose the Sentence in Which All

Multiple Choice

In each set below, choose the sentence in which all the apostrophes are used correctly. Select the letter of the correct answer. Which sentence uses apostrophes correctly?

A) If you dont dot your i's, they will look like 1's.
B) If you don't dot your i's, they will look like 1's.
C) If you don't dot your is they will look like 1s.