Assertion (A): The modern electric power generating plants use only water tube boilers and not fire tube boilers.
Reason (R): The water tube boilers are comparatively cheaper than fire tube boilers
(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