Explanation :
Current flowing in a circuit is defined as the charge flowing per unit time.
A battery connected to the circuit creates the potential difference.
Resistance basically oppose the flow of current.
We know that the relation between the current, resistance and the voltage is given using the Ohm's law as
V =I R
So, it is clear that the voltage is directly proportional to the current flowing.
So, the correct option is (B) Current must increase.