A confusing GRE question on angles
I am new to this forum. I really liked it.
I have the following question. It looks easy but I am confused. Because according to me the answer should be B. As you see in the answer explanation both 45 and 105 are on the figure but I think only 105 indicates a complete turn from one runway to another which is from runway 2 to runway 3, an airplane on runway 2 must turn 105 to the right onto runway 3. But no complete turn from a runway to another is 45.
I need your opinions on this question. Thank you in advance.
(Question and answer explanation are below. Taken from a book.)