an electrician uses a transformer to\na redirect electrical current.\nb shut down electrical current.\nc…

Brief Explanations:

A transformer is an electrical device that changes the voltage level of an alternating - current (AC) electrical power. According to the power formula $P = VI$ (where $P$ is power, $V$ is voltage and $I$ is current), when the voltage is increased, the current is decreased and vice - versa while the power remains approximately the same (neglecting losses). It does not redirect, shut down current or convert DC to AC.

Answer:

C. increase or reduce electrical current.