Economics help and answers with explanation if can :)?

[Chelsea P]

1. In short run a firm operating as a monopolistic competitor will produce to the point at which
a. P=MC
b. MR=MC
c. MR=ATC
d. MC=ATC

2. The short run economies of operation associated with production of an information product arise because
a. AVC is constant, AFC slopes upward, ATC slopes upward
b. AFC is constant and MC slopes downward, so AVC slopes upward
c. AVC slopes downward and AFC is constant, so ATC slopes downward
d. MC is constant and MC slopes upward so that AVC slopes upward

3. In Lond run, monopolistically competitive firms will not earn economic profits because
a. Average total cost will shift up to meet demand curve
b. input prices will be bid up
c. new firms will enter the industry
d. production will not be at minimum average cost

4. In monopolistic competition in Long run, which is TRUE
a. P=MC
b. Economic profit is zero
c. ATC is minimized
d. all of the above