assertion (a) : work done in moving a charge around a closed path, in an electric field is always zero.
reason (r): electrostatic force is a conservative force.

a. Both aseertion (a) and reason (r) are true and reason (r) is the correct explanation of assertion (s)
b. Both assertion (a) and reason (r) are true and reason (r) is not the correct explanation of assertion (a)
c. Assertion (a) is true and reason (r) is false
d. Assertion (a) is false and reason (r) is also false