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Answer is A 8 pi. Screenshot attached
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C. 28 pi

Approach -
1. Find the length of an arch of B to C and
2. Find the length of the entire arc of the circle
3. Subtract it from the total length of the circle arc

1. Find the length of an arc B to C
Length of an arc X / 360 * 2 pi r
i.e. 40/360 * 2 * pi * 18 = 4 pi

2. Total 320 / 360 * 2 * pi * 18 = 32 pi

3. 32 pi - 4 pi = 28 pi
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say , center of the circle O. angle BAC= 40 thus angle BOC=80

arc ABC = arc BC + 1/2 arec BAC = (80/360)*2*18pi + 1/2*{(360-80)/360}*18pi = 8pi+14pi=22pi .......Ans B
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