Since electric field is a conservative field and therefore electric force is also a conservative force. Therefore, work done will not depend in the path taken.

As for a conservative force field, work done on a charge does not depend on the path taken by the charge but depends only on the initial and final points. Therefore, in this situation,

i.e. W_A = W_B = W_C

∴ The work done in taking a point charge from P to all the points A, B and C is the same.