Which pair of angles are adjacent angles?

a.

1 and 4

b.

1 and 3

c.

3 and 6

d.

5 and 8

Your answer is B. 1 and 3.
This is because adjacent angles are angles that could form one angle if the line inbetween them was removed, which means they have a common side. Angles 1 and 3 are the only angles out of the options that have a common side, so they must be the answer.

I hope this helps!