Question

Which one of the following strands of DNA is the complement strand to
C-C-A-T-C-G?

A. G-G-T-A-G-C
B. A-A-C-G-A-T
C. T-T-G-C-T-A
D. G-G-A-T-G-C

Answer 1

I don't know how this works

Answer 2

G-G-T-A-G-C