Answer:
Option A is a price floor, option B is binding and option C is price ceiling.
Explanation:
It is stated that the equilibrium price of a donut is $1.50.
If the government institutes a legal minimum price of $1.80 for a donut, that would be an example of price floor because the price cannot be lower than that. $1.80 is higher than $1.50 so it serves a purpose.
Option B is binding since any donut shop that wants to pay better wages is prohibited from hiring more workers.
The government prohibiting donut shops from selling a donut for more than $1.10 is an example of floor ceiling because the price can not go higher than $1.10.
I hope this answer helps.