The current in the company's lightbulbs was too high. why were the tests you ran relevant to the problem?

a. finding a way to decrease voltage would lead to a decrease in current.

b. finding a way to increase voltage would lead to a decrease in current.

c. finding a way to increase resistance would lead to a decrease in current.

d. finding a way to decrease resistance would lead to a decrease in current.

The correct option is C.
In an electric circuit, resistance is defined as the friction in an electrical circuit which controls the flow of current. In an electric circuit, the resistance involved determined the amount of voltage that will be released; the higher the resistance the lower the voltage that will be released and the lower the resistance the higher the voltage that will be released. Thus, in a situation where the current released is too high, then the resistance has to be increased to lower the current.