Assertion: A wire carrying an electrical current has no electric field inside it.
Reason: Rate of flow of electrons in one direction is equal to the rate of flow of protons in opposite direction.
Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.