Suppose you are a t-shirt producer in a market without price controls. when you sell t-shirts at the equilibrium price, you will not any resources because you will supply what consumers demand.

The correct answer is 'use.' Suppose you are a T-shirt producer in a market without price controls. When you sell T-shirts at the equilibrium price, you will not 'use' any resources because you will supply what consumers demand. In a state of equilibrium, everything is balanced.

The correct answer is 'use' - When you sell T-shirts at the equilibrium price, you will not use any resources exactly for the reason that you're supplying what consumers demand. This basically and effectively means that you won't be using a useless surplus of resources that you wouldn't really want to be using generaly. 

Your answer would be a in this question good luck