If government impose price control, what happens? I have this MCQ homework that I would like your opinion about

Suppose government chooses to impose a price control on a good. Which of the following is NOT a potential consequence of the restrictions on price?   


Excess supply may occur.
Excess demand may occur.
No unexploited opportunities will exist.
People may spend a lot of time waiting in line to acquire the good.
Underground markets may emerge.


I think the answer is 3 because when black market exist with shortage and ppl will want to exploit the situation.
Those are all potential consequences of price controls. It would all depend on how the price controls were done, what measures were put in place alongside them, and all the context of the good itself.

If the price is set at too high a level, excess supply may occur. If too low, excess demand may occur. If it's a good with an extremely limited market that is met under the price control, then no unexploited opportunities may exist. If potential demand is greater than the rate at which it can be retailed, then people may spend a lot of time waiting in line to acquire the good. And underground markets may emerge in any case.