Correct answer: C. Citizens holding a peaceful sit-in
Explanation: The direct answer is C, citizens holding a peaceful sit-in. Freedom of peaceful assembly allows people to gather together without weapons to express an opinion, make a demand or draw attention to a public issue. The key reasoning word is peaceful: a lawful, non-violent gathering is protected, although reasonable regulation may apply for public order. Option A is wrong because caste discrimination violates equality and dignity; it is not peaceful assembly. Option B is wrong because making a child do hazardous work concerns exploitation and violates child-protection rules. Option C is correct because a peaceful sit-in is a group gathering used to express a public view, and it fits the right of assembly. Option D is wrong because stopping someone’s language concerns expression or linguistic freedom, and the action itself may violate rights; it is not an example of holding an assembly. Exam cue: identify both “gathering” and “peaceful”; violence or discrimination is not protected assembly.