Which of the following is a simple sentence?

Question

A. Karen and David arrived at the airport at 3:35 P.M. and took a taxi to their hotel.
B. When I realized I was too late, I called David's cell phone and made arrangements to meet them in town.
C. I got to the airport late because the traffic was so terrible.
D. I went to the airport, but I was too late to meet them.

My answer is D

Answer 1

Nope.

http://www2.ivcc.edu/rambo/eng1001/sentences.htm