Which of the following is a compound complex sentence?
A. Though the weather was delightful, we were surprised by afternoon thunderstorms
B. The weather was delightful, so we decided to have a picnic
C. We decided to have a picnic, but we were surprised by afternoon thunderstorms.
D. Because the weather was delightful, we decided to not have a picnic, but we were surprised by afternoon thunderstorms.
