Thank you, Justin,

I should have changed the Question as you suggested in order to avoid the double meaning. I just didn't know why two native speakers changed that way. Actually, they added 2) to "and sugar." on the spot. Originally, 2) was "Tea with milk." If 2) were "Tea with milk.," it would be completely wrong. So the answer would be 3).
Please allow me to ask you one more. I have only to change the multiple answers 3) on the hand-out, because the dialogue and the question have already recorded. I cannot change it by now. How can I change 3), being the correct answer 2)?

Alternative (1)
3) Orange juice.

Alternative (2)
3) Fruit juice (just cross out "A mixture of")

Thank you again in advance.