Determine the Constant of Variation for the Stated Condition

Multiple Choice

Determine the constant of variation for the stated condition.
-If the resistance in an electrical circuit is held constant, the amount of current flowing through the circuit is directly proportional to the amount of voltage applied to the circuit. When 4 volts are applied to a circuit, 100 milliamperes of current flow through the circuit. Find the new current if the voltage is increased to 13 volts.

A) 325 milliamperes
B) 52 milliamperes
C) 312 milliamperes
D) 350 milliamperes