Which of the following is a compound-complex sentence?
A Dillon, a salesman, has very strong opinions about his competitors.
B Because Dillon is a salesman, he has very strong opinions about his competitors.
C Dillon is a salesman, but he hasn't shared his opinions about his competitors with me.
D Because Dillon is a salesman, he has very strong opinions about his competitors, but he hasn't shared them with me.