I had to re-post this question, but hope you have a good day and stay safe :)

#5 is number b
#6 is number b as well.
these are the answers because the opposite side can be found when u put an arrow straight up from the angle. as you can see , if c had an angle , the opposite would be line segment AB

The rest don't make sense so i say the first one.

Their worse are not meaningful;