Which of the following is a complex-compound sentence?

Select one:

a. I got the salad ready, and Liam grilled the chicken.

b. I got the salad ready, and Liam, who is my cousin, grilled the chicken.

c. While I got the salad ready, Liam grilled the chicken.

d. I got the salad ready, while my cousin Liam grilled the chicken.


please help me out ASAP ​