Final answer:
Ohm's law states that the current through a conductor is directly proportional to the voltage across it. This relationship holds true in most simple circuits where Ohm's law is applicable.
Step-by-step explanation:
Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points, given that the temperature and other physical conditions remain constant. Mathematically, Ohm's law can be expressed as V = IR, where V is the voltage, I is the current, and R is the resistance. This relationship holds true in most simple circuits where Ohm's law is applicable. Therefore, the correct answer to the question is C) Ohm's law is applicable.