50 degrees (option B)
Step-by-step explanation:
Angle 1 and angle 2 are complementary angles.
Complementary angles sum up to 90 degrees.
angle 1 = 40 degree
angle 1 + angle 2 = 90 degrees
40 degree + angle 2 = 90 degrees
angle 2 = 90 degrees - 40 degrees
angle 2 = 50 degrees (option B)