Question

Which sentence has correct punctuation?
A.
Ron and Tina's parents just celebrated their thirty fifth wedding anniversary.
B.
All high school seniors should assemble in front of the sign in table.
C.
Leticia excelled on the entrance exam because she was well prepared.
D.
Davis won the science fair for his exhibit on keeping a frost free lawn.

Answer 1

C

Sentence C is correctly punctuated. The others need hyphens ("thirty-fifth," "sign-in table," "frost-free lawn").