Assertion (A): Axial flow air compressors need many stages to develop high pressure ratios.
Reason (R): The amount of turning of air flow in blade row is limited by the occurrence of separation, phenomenon caused by adverse pressure gradient.
(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