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In the given figure, O is the centre of the circle. If `angle BAO = 30^@` and `angle BCO = 50^@`, then `angle AOC` is equal to:
दिए गए आकृति में, O वृत्त का केंद्र है। यदि `angle BAO = 30^@` और `angle BCO = 50^@`, तो `angle AOC` का मान है :

A

`160^@`

B

`60^@`

C

`40^@`

D

`80^@`

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