We apply the sine rule here: a/sin(A) = b/sin(B) = c/sin(C) The side opposite to angle B is AC The side opposite to angle A is BC The side opposite to angle C is AB 8.75/sin(37) = 12.35/sin(A) A = 58.15° The sum of the three angles is 180° Angle C = 180 - 58.15 - 37 Angle C = 84.85° The answer is B