Step 1: Understanding the Concept:
The question asks to identify the core features of the traditional caste system in India, as described in sociology by thinkers like G.S. Ghurye.
Step 2: Detailed Explanation:
(A) Caste is an ascribed status: This is correct. A person's caste is determined by birth and is not something they can change.
(B) Caste groups are 'endogamous': This is correct. Endogamy is a strict rule where marriage is permitted only within one's own caste group.
(C) Caste is an achieved status: This is incorrect. An achieved status is one that is earned or chosen (like a profession). Caste is the opposite; it is ascribed.
(D) Castes involve segmental organization: This is correct. The caste system divides society into a number of distinct, hereditary segments or groups (the castes), each with its own customs, rules, and position in the hierarchy.
(E) Caste groups are based on choice of individuals: This is incorrect. Membership in a caste group is determined by birth, not by individual choice.
Therefore, the correct characteristics are (A), (B), and (D).
Step 3: Final Answer:
The correct combination of features of the caste system is (A) Ascribed status, (B) Endogamy, and (D) Segmental organization.