2009 IAABO Exam Question 41

[mathuc]

Last night our board wrote the IAABO exam... and I'm stuck on whether or not I got this question right. Here's the question:

B-1 Jumps from his/her frontcourt and intercepts A-1's throw-in pass. B-1 lands in backcourt. The official rules this a legal play. Is the official correct?

I said YES - because I was pretty sure there's something that states that when you intercept a pass you can land in your own backcourt and it's legal. Can't find the rule though and it's eating me.... any help would be appreciated!