Which of the following is a compound-complex sentence?


Cheryl, a farmer, has very strong opinions about GMOs.


Because Cheryl is a farmer, she has very strong opinions about GMOs.


Cheryl is a farmer, but she hasn't shared her opinions with me.


Because Cheryl is a farmer, she has very strong opinions about GMOs, but she hasn't shared them with me.

The following sentence is a compound-complex sentence:

Because Cheryl is a farmer, she has very strong opinions about GMOs, but she hasn't shared them with me.