Assertion (A) : The origin of Himalayas is due to the collision of the Indian Subcontinent with Eurasian landmass.
Reason (R) : The convergence of crystal plates is often associated with mountain building.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true