Question

Which one of the following sentences is punctuated correctly?
A. I found a large, smooth, rock on the beach yesterday.
B. Darleen chose Tara, Holly, and, Marlene as her lab partners.
C. She kept my surprise a secret, but she had a hard time doing it.
D. Della arrived on time, it was just two o'cloc

Answer 1

The sentence punctuated correctly is C. She kept my surprise a secret, but she had a hard time doing it.

Corrected sentence.
I found a large and smooth rock on the beach yesterday
Darleen chose Tara, Holly, and Marlene as her lab partners.
Della arrive on time, and it was just two o'clock.