The magnitude of the electric current is directly proportional to the of the electric field. a) voltage b) electric current c) resistance d) interference

According to the statement of OHM's Law,

The current in an electric circuit is directly proportional to the voltage across that circuit. This means, larger the voltage , more will be the current flow. Mathematically this can be stated as:

I = V/R

Here 1/R is the constant of proportionality and R represents the Resistance of the circuit.

This equation is also stated in texts as: 

V = IR

So, the correct answer is option A. Voltage