The string of bases A-U-C-C-U-G-A connects to which of the following strings via a weak force hydrogen bond?

Question

U-A-G-G-A-C-U
C-G-A-A-G-T-C
C-A-U-G-A-T-C
A-U-C-C-U-G-A
U-A-G-G-A-C-U

can some one please explain this.
I red the chpater but still dont understand

Answer 1

A....T or when U replaces T A.....U
C:::::G
So the first and last choices are the correct ones.