A. degrees
B. 40 degrees
C. 45 degrees
D. 50 degrees

Answer:
Step-by-step explanation:
b = 180 - (32+69+29) = 180 - 130 = 50
Answer: option D. 50°
Step-by-step explanation:
69 + b +32 + 29 = 180(angle on a straight line
130 + b = 180
b = 180 — 130 = 50°