Which of the following would decrease the flow of current through the lights in the circuit shown above?

a
Decreasing the battery voltage and increasing the resistance of the lights.
b
Increasing the battery voltage and increasing the resistance of the lights.
c
Increasing the battery voltage and decreasing the resistance of the lights.
d
Decreasing the battery voltage and decreasing the resistance of the lights.

The correct answer is a) Decreasing the battery voltage and increasing the resistance of the lights.