Question

Which sentence correctly forms the plural of the letter E? A. On that road sign, the four Es' in TENNESSEE are starting to fade. B. On that road sign, the four E's in TENNESSEE are starting to fade. C. On that road sign, the four Es in TENNESSEE are starting to fade.

Answer 1

In this case it would be E's

B. On that road sign, the four E's in Tennessee are starting to fade.

The rule is use an apostrophe s to form plural of single letters.

Hope this helps.