Concept:Emphatic stress highlights the word being contrasted with a different word of the same class in the question.
Explanation:The sentence stresses CARTON.
So it must answer a question that contrasts CARTON with another container, such as TIN.
Option A asks: Did the woman buy a tin of milk?
The appropriate reply is: The woman bought a CARTON of milk.
Other options would shift the emphasis to FISH, MAN, or SELL, not CARTON.
Answer:A. Did the woman buy a tin of milk?