Step 1: Understand collective responsibility.
It means the whole Council of Ministers works as one team. If the team loses the trust of the elected house, they all resign together.
Step 2: Separate Union from State Articles.
Articles 74 and 75 deal with ministers at the Union level. Articles 163 and 164 deal with ministers at the State level.
Step 3: Focus on the State, since the question says Legislative Assembly.
The Legislative Assembly belongs to a State, so the answer must come from Article 163 or 164.
Step 4: Pick the exact clause.
Article 164(2) clearly says the State Council of Ministers is collectively responsible to the Legislative Assembly of the State.
Step 5: Rule out the rest.
Article 74 is advice to the President, Article 75(3) is Union responsibility to the Lok Sabha, and Article 163 is advice to the Governor.
Answer: Article 164(2) (Option 4).