Why Does Economic Efficiency Not Always Result in Fair and Equal

Why does economic efficiency not always result in fair and equal treatment?

A) Efficiency demands cost-minimization, which may cause the nonproduction of expensive items or adjustments designed to ensure that disadvantaged members of society are catered for.
B) Market efficiency requires that only profitable goods be produced in order to maximize the return from using scarce resources, and some goods for the disadvantaged may not always yield profits.
C) Market efficiency does not always allow firms to hire disadvantaged members of society so labor and governments sometimes have to step in to demand hiring of some of these individuals.
D) All of these explanations are correct.