Sensitivity of a moving coil galvanometer can be increased by:

Sensitivity of moving coil galvanometer is given by the formula

NAB/k

where N is the number of turns.

So, the sensitivity is directly proportional to the number of turns.

Thus, to increase the sensitivity of a moving coil galvanometer number of turns is to be increased.

Thus, option (B) is correct.

Hence option (B) is correct.