This question requires identifying the views on caste expressed by B. R. Ambedkar in his work "Annihilation of Caste". The provided correct answer indicates options C and D are correct.

Ambedkar's Views on Caste

B. R. Ambedkar's seminal work, "Annihilation of Caste", presents a radical critique of the caste system. Based on the provided correct answer, the following views are attributed to him:

• Option C: Caste makes public opinion impossible.

  Ambedkar argued that the inherent divisions caused by caste prevent the formation of a unified public consciousness or solidarity. Loyalty to one's caste often supersedes broader social or national identity, hindering the development of a cohesive public opinion essential for social progress.

• Option D: How to abolish caste is a question of supreme importance.

  The very title and purpose of Ambedkar's work underscore the critical urgency he placed on the eradication of the caste system. He considered its abolition paramount for the social, economic, and political liberation of the oppressed.

Analysis of Options

While elements related to the social structure and reproduction within caste (like blood purity or notions of selective mating) are discussed by Ambedkar, options C and D represent core arguments central to his thesis in "Annihilation of Caste" regarding the functioning and necessity of abolishing the system.

Therefore, the views that {Caste makes public opinion impossible} and {How to abolish caste is a question of supreme importance} are directly aligned with B. R. Ambedkar's arguments in "Annihilation of Caste".