There are red, blue, yellow, white and purple leather balls in five boxes  A, B, C, D, E  The five guessed the color of the ball in the box  A: the second box is purple and the third box is yellow  B: the second box is blue and the fourth box is red  C: the first box is red and the fifth box is white  D: The third box is blue and the fourth box is white  E: the second box is yellow and the fifth box is purple
When they were finished, they opened the box and found that each of them had only one correct guess
The ball in the fourth box is white.