This question involves the concepts of Ohm's Law.
The change that will increase he current is "D. Replace the wire with one that is thinner"
According to Ohm's law the current is inversely proportional to resistance. Hence, the current can be increased by decreasing the resistance.
Let us analyze each scenario separately:
A. Replace the wire with one that is thicker: Increase in thickness of wire shall increase its resistance. Therefore, the increase in resistance will decrease the current.
B. Replace the existing battery with a smaller battery: Smaller battery will produce lesser charges. Hence, it will decrease the current.
C. Add an electric bell to the circuit: Adding electric bell will add resistance to the circuit. Hence, the resistance will increase and current will decrease.
D. Replace the wire with the one that is thinner: This will decrease the resistance of the wire and in turn increase the current through it.
Therefore, only option that will increase current is option D.
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