Which sentence contains an error in the use of apostrophes?

A.
Do not use &s or text-messaging abbreviations in your writing.

B.
Oh, dear, he's written all these 4s backwards.

C.
As in this font are not very legible.

D.
When he writes, my little brother makes b's for d's.

Question

Which sentence contains an error in the use of apostrophes?
  
 
 A.
Do not use &s or text-messaging abbreviations in your writing.
 
 B.
Oh, dear, he's written all these 4s backwards.
 
 C.
As in this font are not very legible.
 
 D.
When he writes, my little brother makes b's for d's.

anonymous · Answer

C.
It should be: A's in this font are not very legible.

anonymous · Answer

C