Microsoft charges a price of $$599$ for a copy of Windows $7.$ Is this pricing decision rational?

A$.$ Microsoft's choice cannot be rational: the price is clearly more than most people are willing and able to pay

B$.$ We cannot assume that this pricing decision was rational because we do not have enough information to make an assumption.

C$.$ When we assume the managers at Microsoft have used all available information and have weighed all known benefits and costs, we are assuming rationality.

D$.$ Microsoft's choice was rational: the price will maximize profit.