The teacher ordered Kamal to leave the room and . . . . . . . him to return.

Here is a more detailed explanation of each option:

• Option A, “stopped,” means to “prevent from continuing or happening.” In this case, the teacher did not stop Kamal from leaving the room. The teacher ordered Kamal to leave, and Kamal left.
• Option B, “refused,” means to “decline to do something.” In this case, the teacher did not refuse to let Kamal leave the room. The teacher ordered Kamal to leave, and Kamal left.
• Option C, “forbade,” means to “prohibit or ban.” In this case, the teacher forbade Kamal to return to the room. This is consistent with the meaning of the sentence.
• Option D, “challenged,” means to “ask someone to compete with you in a game or contest.” In this case, the teacher did not challenge Kamal to return to the room. The teacher forbade Kamal to return, which is different from challenging someone to do something.