Your Answer is

Correct Answer is E

Explanation

A and B each take a blue ball and put it back. This may be the same blue ball, or it may be two different blue balls, so A cannot be sure. In terms of color, drawing two blue balls can only show that there are at least blue balls, but it cannot be determined whether there are balls of other colors, so B and C cannot be determined, D’s inference logic is unreasonable, and E’s inference logic is correct. Choose E.