Assertion (A): As the soil is sandy and saline deserts remain agriculturally unproductive.
Reason (R): Tribal people who live in deserts practice food gathering and hunting.
(A) Both Assertion (A) and Reason (R) are true. (R) explains (A).
(B) Both Assertion (A) and Reason (R) are true. (R) does not explain (A).
(C) (A) is true; (R) is false.
(D) Both (A) and (R) are false.