Assertion : In planetary motion angular momentum of system remains constant. But linear momentum does not remain constant.
Reason : Net torque on this system about any point is zero.
(a) If both Assertion and Reason are true and the Reason is correct explanation f the Assertion.
(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) If Assertion is true, but the Reason is true.
(d) If Assertion is false but the Reason is true.