Find the cost of fencing around a circular field of diameter 18 m at the rate of Rs.2.50 a meter?	Choose the correct option:
A) 138	B) 132	C) 150	D) 140	E) 222
2 * 22/7 * 9 = 56   56 * 2 1/2   = Rs.140   Answer: 140
<result>D</result>
Find the cost of fencing around a circular field of diameter 18 m at the rate of Rs.2.50 a meter?