May someone please explain to me why is the answer A but not C?
Is it asking about the total distance travelled within the mirror before leaving it?

Thank you!

Since the calculator given to us will be simple, how will I figure out that the angle is approximately 73 deg (other than eyeballing a sketch)?

Thanks!

Can someone please explain to me how was one able to come to the conclusion that B is the correct answer?

Also, how did they get 12y and 109?

Thanks!