Answer:
A and B are both correct, but answer A has one more opposite angle and is the best choice
Explanation:
a pair of non-adjacent angles formed by the intersection of TWO lines.
It is clearly not D 7&10 are adjacent
It is not C 1&5 are formed by THREE lines
The only difference between answer A and B is the extra angle 7&8 in answer A. IF angles 5&10 and 6&9 are good angles then it looks like to me that angle 7&8 is a good angle