Which of the following is a compound sentence?

A. To get to the zoo, we took the train and a cab
B. Before we left, I bought a hat at the gift shop.
C. It was a beautiful day, so we decided to go to the zoo.
D. We saw pandas during our visit to the zoo.

A. To get to the zoo, we took the train and a cab

are you sure?

I apologize for the error in my previous response. The correct answer is:

C. It was a beautiful day, so we decided to go to the zoo.

This is a compound sentence because it consists of two independent clauses connected by the coordinating conjunction "so."