A player crosses the line separating both sides of the court but then goes back behind that same line; what violation is called?

Once the offensive team has gotten the ball over half court, they cannot go back into the defender's half court with the ball. This is called over-and-back. Carrying, or palming, is like a double dribble. A backcourt violation is an illegal play that the offense commits while in their own half of the court. Teams can commit backcourt violations by taking too long to cross the mid-court line, or by dribbling or passing into the backcourt after they cross the mid-court line.

Explanation:

it will be called an offside because let's say soccer and if you cross the middle line the coach sees he will call violation then that's that so yeah...

i agree d is most definitely correct!