Ball becomes live during a throw-in

[Jay R]

The ball becomes live during a throw-in when the ball is at the disposal of the thrower-in.

Here is a question I found on a Refresher Test (NCAA rules):
The trail official bounces the ball to A1 for a throw-in. Before A1 catches the ball, B2 fouls A2. According to this Test, this is a personal foul. As far as I`m concerned, the ball is still dead, thus a technical foul is the call. Am I wrong?