If P = MC for all goods in a free-market economy, then

a.the desire for utility maximization will lead consumers to buy only those goods that have low opportunity costs.

b.the desire for profit maximization will lead all firms to stop producing in the long run (though possibly not in the short run).

c.the desire for profit maximization will lead consumers to buy the amount of each good at which MU = MC.

d.the desire for utility maximization will lead consumers to buy the amount of each good at which MU = MC