Sin(A) / a = sin(B') / b' where a is the side opposite to the angle A and B is the side opposite to the angle B'. So
sin(45)/16.5 = sin(B')/22 B' = 70.53
However, notice that B' in your triangle is an obtuse angle, so you also need to know the property of sine
sin(B') = sin(180 - B') So another B' that can work is: sin(70.53) = sin(180 - 70.53) sin(70.53) = sin(109.47) So B' = 109.47. It seems that the closest one in your answer is 109.95 so I think out of elimination, B is your answer.
