If Q = net charge, t = time, then which of the following equations is correct?

Correct option is B

An electric current is a flow of charged particles. It is measured in amperes (A), and is defined as the charge per unit time. In other words, the current is the amount of charge that flows through a conductor in a given amount of time. The equation for current is I=Q/t, where I is the current, Q is the charge, and t is the time.
In this case, we are given that Q is the net charge and t is the time. Therefore, the correct equation is I=Q/t.
Here, Q = quantity of charge (electricity) in coulombs (C) I = current in amperes (amps, A) t = time (seconds).