The following figure shows a circle with centre O

Find the angle r .
A 153°
B 104°
C 76°
D 38°

Please help me to solve this . If you can solve it , can you explain it to me ? I had migraine solving this question . Thank you ​

The following figure shows a circle with centre O Find the angle r A 153B 104C 76D 38Please help me to solve this If you can solve it can you explain it to me I class=