Please help me understand the following exercise, thank you:

7. George has the following demand curve for selling vegemite:

Price ($)	Quantity
8.00	0
7.00	1
6.00	2
5.00	3
4.00	4

In addition, George has a marginal cost of $3.00 per unit.

Refer to the above Table,what is George's profit-maximizing level of output?

Select one:

a.4

b.1

c.2

d.3

10. In the long run, a firm in a perfectly competitive market operates

Select one:

a.with excess capacity and a monopolistically competitive firm operates with excess capacity.

b.with excess capacity and a monopolistically competitive firm operates at its efficient scale.

c.at its efficient scale and a monopolistically competitive firm operates at efficient scale.

d.at its efficient scale and a monopolistically competitive firm operates with excess capacity.

16. In long run equilibrium, a monopolistic competitor will have

Select one:

a.Price = Average Cost

b.Price = Average Variable Cost

c.Price = Marginal Revenue

d.Price = Marginal Cost

17. With perfect price discrimination,

Select one:

a.consumer surplus is gained as monopoly profits are eliminated.

b.the monopoly charges each customer an amount equal to the monopolist's marginal cost of production.

c.the deadweight loss from monopoly is eliminated.

d.the monopoly eliminates all price discrimination by charging each customer the same price.