Four particles of masses m, 2m, 3m and 4m are arranged at the corners of a parallelogram with each side equal to a and one of the angle between two adjacent sides is `60^(@)`. The parallelogram lies in the x-y plane with mass m at the origin and 4 m on the x-axis. The centre of mass of the arrangement will be located at
A. `(sqrt3/2a, 0.95a)`
B. `(0.95a, sqrt3/4a)`
C. `((3a)/4,a/2)`
D. `(a/2,(3a)/4)`
