Answer:
C
Explanation:
Two angle are side to be compliment if there sum is 90°
<B + <A = 90°
<B = 90° - <A
<B = 90° - 40°
<B = 50°
Two angle are side to be compliment if there sum is 180°
<B + <C = 180°
<C = 180° - <B
<C = 180° - 50°
<C = 130°
m<B + m<C = 50° + 130° = 180°