Which of the following is a complex-compound sentence? a. Although it is considered old-fashioned, I prefer phone calls to text or email.

b. As much as they complain, sometimes they admit that I have a point, and it can be quicker to call than to text back and forth several times.

c. My friends roll their eyes at me, and some of them won't answer their phones.

d. A lot of people are uncomfortable making phone calls, but I think they are more efficient.