Battle Of Plassey

Assertion (A): Within half a century of the Battle of Plassey, the phenomenal prosparity of Bengal suffered a serious set-back. Reason (R) : The manufacture of cotton goods the most important item ofexport from India, enormously increased in other parts of India, while it declined in Bengal. Which of the following option is correct ? (a) Both A and R is true and R is the correct explanation of A (b) Both A and R is true but R is not a correct explanation of A (c) A is true but R is false (d) A is false but A is true