Sal M. Onella wrote:
3. Despite the absolute correctness of the apostrophe for the plural of
numbers and letters, I see a lot of acronyms and abbreviations made plural
by the addition of an "s" without the apostrophe and I don't flinch.

From what I remember, that's not universally incorrect.

Oh, and I'm taking your apostrophe quiz, and it appears there's an error
in the "correct" choice: (B) uses "its" as the contraction for "it is".
So the answer to 17 should be "None of the above". (I scored 100% also.)

Incidental note: I've never understood how people who use "it's" as a
possessive never even think to use "hi's" (though some use "her's" and
"their's").

--
Britney Spears' Guide to Semiconductor Physics
http://britneyspears.ac/lasers.htm