Fill in the blank (preposition with “deals ___”) “Besides other provisions, that shopkeeper deals ______ cosmetics.” Choose the correct preposition.

Given data

• Verb–preposition collocation required after “deals.”

Concept/Approach
In commercial contexts the standard collocation is “deal in (goods).”

Option analysis
in — correct collocation: “deals in cosmetics.”with — means “handle” people/things, but not the goods traded.at/by — incorrect after “deal” in this sense.

Final Answer
in