1. A train of proper length Lo is moving at a velocity v = 0.8c towards a tunnel of which the proper distanceis also L0．At time t = O, the front end of the train meets the entrance of the tunnel viewed both from theground and the train. Suppose the time when the rear end of the train mects the entrance of the tunneiviewed from the ground and the train is tA and t'A, respectively, and the time when the front end of the trainmeets the exit of the tunnel viewed from the ground and the train is tB and t'_{B. Which of the following isincorrect?
(A) In the frame of the ground, tA ＜ tB.
(B) In the frame of the train, t'B ＜ t'A.
(C) In the frame of the train, the duration from the train entering the tunnel and entirely get out of thetunnel is}