The Lei Feng team at a school decided to water the small tree on the campus, but when they arrived at the school, they found that there were exactly three students in the school, and the small tree had also been poured. A said, "It was done by B. " B said: "I didn't do it. " C said, "I didn't do it. " Two of these three people told falsehood and one told the truth. From this, which of the following is watering the tree? ['A.', 'B.', 'C.', 'others.']