Which of the following statements are correct about Al-Biruni's description of the caste-system:

(A) He tried to explain the caste system by looking for parallels in other societies, such as ancient Persia.
(B) He accepted the Brahmanical description of the caste system and also the notion of pollution.
(C) According to him, the conception of social pollution, intrinsic to the caste system, was contrary to the laws of nature.
(D) He remarked that everything which falls into a state of impurity strives and succeeds in regaining its original condition of purity.

Choose the correct answer from the options given below:

(A), (C) and (D) only

The correct answer is Option (4) → (A), (C) and (D) only

(A) He tried to explain the caste system by looking for parallels in other societies, such as ancient Persia. (Correct)
(B) He accepted the Brahmanical description of the caste system and also the notion of pollution. (Incorrect). In spite of his acceptance of the Brahmanical description of the caste system, Al-Biruni disapproved of the notion of pollution.
(C) According to him, the conception of social pollution, intrinsic to the caste system, was contrary to the laws of nature. (Correct)
(D) He remarked that everything which falls into a state of impurity strives and succeeds in regaining its original condition of purity. (Correct)