NFHS Test Question: What Does it Mean?

[Spence]

I'm preparing for the NFHS exam and found some old NFHS exams online.

Here is a true/false question:

If the ball is to become dead when the last free throw of a penalty is unsuccessful, players shall not take positions along the free-throw lane.

The answer given is true.

What exactly is the question asking or dealing with? Does it mean AFTER the last free throw is unsuccessful? If so, what does the last part mean about taking positions along the free throw lane?