I was thinking the same thing. Because buying milk from this store is sufficient because I could also buy bread and fruits. But going to the store is necessary to buy milk.

Quick question, say if we were to get a question similar to the tiger where they say P: Tigers are dangerous animals. C: Mammals do not make good pets. If we were to say that this is an argument with premise and conclusion, will it be deemed right or will they mark us for making assumptions not mentioned explicitly in the text?