Consider a simple circuit. What can we do to make the bulb dimmer?
-add longer wires
-increase voltage
-increase the current of the wire
-increase the resistance of the bulb
-shorten the wires

increase the resistance of the bulb

Explanation:

In a simple circuit the power dissipated in a light bulb is proportional to the product of the voltage and the current

         P = i V

Besides the voltage is

       V = i R

       P = i² R

Therefore, a simple method to decrease the power dissipated in a bulb to increase the resistance of the bulb, for this a series resistance is placed in the circuit.

Consequently the correct answer is increase the resistance of the bulb

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