14) The host has five locked boxes. Three of them contain rocks, and two contain diamonds. The host knows what is inside in each of the boxes. You are asked to randomly select one box (without opening it). After you select a box, the host opens a box which contains a rock from the rest four boxes and shows you. Then, the host asks you whether to switch to another unopened box. If you choose to switch and randomly select one unopened box, the probability of getting the diamond is: A) 6/15 B) 7/15 C) 8/15 D)9/15 E) None of the above