Demand $(D)$ and $MC=$ ATC curves

Demand $($D$)$ and marginal revenue $($MR$)$ curves

Marginal revenue $($MR$)$ and $MC=$ATC curves

b$.$ Firms with the ability to first$-$degree price discriminate will sell units equal to the intersection of which two curves?

Demand $(D)$ and $MC=$ATC curves

Demand $($D$)$ and marginal revenue $($MR$)$ curves

Marginal revenue $($MR$)$ and $MC=$ATC curves

c$.$ Firms that have the ability to first$-$degree price discriminate will have profits that are

greater than a firm that does not have the ability to price discriminate.

less than a firm that does not have the ability to price discriminate.

equal to a firm that does not have the ability to price discriminate.