Each of five boxes contain 15 red balls and 25 black balls. We select a ball from the first box randomly and place it into the second one. Then, we select a ball from the second box and place it into the third one, and so on, until finally we select a ball from the 5th box:

A: the ball selected from the 5th box is red;

B: the ball selected from the 5th box has the same color with that selected from the 4th box;

C: all five balls selected are of the same color.