Can you circle exactly four of these numbers such that the total is twelve?

Below are four multiple-choice entrance exam questions. Can you find the answers?
1. The answer to Question 2 is:
A. B
B. A
C. D
D. C
2. The answer to Question 3 is:
A. C
B. D
C. B
D. A
3. The answer to Question 4 is:
A. D
B. A
C. C
D. B
4. The answer to Question 1 is:
A. DRiddle Answer
B. C
C. A
D. B
Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.
Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?
Riddle Answer