Answer: C) 126
Step-by-step explanation: first, you need to use this equation...
m∠A + m∠B + m∠C + m∠D = 360°
=> m∠A + 97° + 47° + 90° = 360° add all of the numbers...
=> m∠A + 234° = 360° subtract both sides by 234
=> m∠A = 360°- 234°
=> m∠A = 126°
Hope you've understood...