Answer: 1) quantity of output is lower than it was previously.
Step-by-step explanation:
In a competitive firm, the Price is the same as the Marginal Revenue and as this firm is maximising its profit, it is the same as Marginal cost as well.
If the price drops to $18, this would mean that the Marginal cost is now higher than the Marginal revenue which means that the company is making losses per every additional unit sold.
Company will respond by cutting production so that it can bring the marginal cost down to the Marginal revenue level thereby resulting in the quantity output being lower than it previously was.