What caused protests in South Vietnam during the presidency of Ngo Dinh Diem?

if this is the question i think it is then the answer im going with is, diem enacted policies that were oppressive to Buddhists

Explanation:

basically diem was catholic and buddhists couldnt really express themselves because of the Catholics and how powerful diems protests became to be like. forreal it was like skirt 2020 protests but a long time ago

your answer will most likely be a.