Hi, Can we use the theorem(sorry I don't remember the name of the theorem) that states : the angle at the centre of a circle is twice the angle at the circumference if both angles stand on the same arc. If yes , then is the option A not sufficient ? Angle AOC = 60 (By the above stated theorem, Angle...

Apologies, the answer should be C.

I incorrectly considered , o - the centre of the circle on line AB.

Regards,
Shikhar Hasija