Correct answer: A. Because it rejects birth based humiliation and exclusion
Explanation: The direct answer is A, because abolition of untouchability rejects birth-based humiliation and exclusion. Untouchability is not merely a personal dislike; it is a social practice that treats some people as impure or unfit for equal contact, spaces, services, or participation because of caste. The reasoning is: caste by birth is not a valid reason to deny a person equal status; forcing exclusion causes humiliation; exclusion prevents equal participation; therefore abolishing untouchability is central to social equality and human dignity. Option A is correct because it identifies both the birth-based cause and the harm of humiliation and exclusion. Option B, tax exemption, concerns money and taxation, not caste-based social treatment. Option C, an election slogan, reduces a constitutional and moral principle to campaign language and does not explain its purpose. Option D, foreign policy, concerns relations with other countries and is unrelated to equality within society. The protection is important because equality must be real in everyday life, not merely written as an ideal. Exam cue: untouchability means caste-based exclusion; its abolition protects equality, dignity, and equal social participation.