Assertion (A): Some persons have the difficulty to see the objects in dim light during night. Reason (R): Cones respond less to the illumination.

(a) (A) is incorrect and (R) is correct.

(b) (A) is correct and (R) is incorrect.

(c) Both (A) and (R) are correct but (R) is not the correct explanation of (A).

(d) Both (A) and (R) are correct but (R) is the correct explanation of (A).