Step 1: Core content.
Article 368 lays down the amendment procedure—special majority in each House; and for federal features, ratification by at least half the states.
Step 2: Distinguish unrelated articles.
352 (National Emergency), 356 (President’s Rule), 370 (special status of J& K—since abrogated) do not deal with amendments.
Step 3: Conclude.
\[
\boxed{\text{Article 368 (Option C).}}
\]