Jin Has Been Invited to Attend His First Sales Meeting

Jin has been invited to attend his first sales meeting and wants to be an active and productive member from the very beginning. Which of the following should he do to make a good impression?

A) He should keep his smartphone on so that he doesn't miss an important call during the meeting.
B) He should come prepared to the meeting by doing any preliminary work required.
C) He should use body language to show whether he's bored; the meeting leader will appreciate his honesty.
D) He should wait to share his views after the meeting so that the meeting can move along efficiently.