To Line Something Up
To Put Something In Order
transitive verb, ichidan verb
並ぶ is when something is lining up. 並べる is when you're lining something up. In other words, 並べる is transitive. It means to line something up or to put something in order. You know this because when it comes to bears (べる), you have to line them up yourself, because they won't be doing it for you, that's for sure.
The reading of the kanji is same as for 並ぶ, so if you know that you can figure out the reading for this one as well.
ボーリングのピンを並べるのにどうしてそんなに時間がかかったんですか。
Why did it take you so long to line up the bowling pins?