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The work done an a particle of mass m by...

The work done an a particle of mass `m` by a force
`K[(x)/((x^(2) + y^(2))^(3//2)) hati +(y)/((x^(2) + y^(2^(3//2))) hatj)]
(K being a constant of appropriate dimensions), when the partical is taken from the point `(a,0)` to the point `(0,a)` along a circular path of radius a about the origin in x - y plane is

A

`(2kpi)/a`

B

`(kpi)/a`

C

`(kpi)/(2a)`

D

0

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