At no time can an offside player interfer with play. Although, I think the question may be testing your knowledge that pertain to which actions by the opponent or teammate can put a player onside. Basically everything covered in Law 11, with respect to open field play.
The very last sentence in Law 7 is:
"Whatever a player does must be in accordance with he laws of the game."
I have always assumed that Law 7 provides a fall-back position for matters not otherwise covered. For example I think it is the right place to put a sentence saying "The game is to be played by players who are on their feet."
You couldn't resist it, could you OB. Of course, one might then wonder why Law 14 allows the player on the ground to pass the ball. But writing that might itself be viewed as unsportsmanlike behaviour ....