If the number of collisions of the free electrons with the lattice is decreased then the drift velocity of the electrons will increase.

The current is given by

Where

I is the current

n is the number of electrons

e is the charge of an electron

A is the area of cross section of a conductor

is the drift velocity

From the above formula current i is directly proportional to drift velocity. So when the drift velocity is increased then the current will increase.

If the number of collisions of the free electrons is decreased then the current will increase. Option A is correct.