Assertion: When a particle is moving in a straight line with a uniform velocity, its angular momentum is constant.
Reason: The angular momentum is non-zero, when particle moves with a uniform velocity.
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.