Which relation of the following is true?

​The correct answer is (c) V = IR.

This is Ohm's Law, which states that the voltage (V) across a resistor is equal to the current (I) flowing through the resistor multiplied by its resistance (R).

In other words, the relationship between voltage, current, and resistance is given by:

•  Ohm’s Law is a fundamental principle in electrical circuits, used to calculate voltage, current, or resistance in a circuit.
•  The formula is applicable in both DC and AC circuits with purely resistive components.
•  If resistance increases while keeping the current constant, the voltage increases proportionally.​