In a perfectly competitive equilibrium with production and trade,which of the following results occur(s)?

Question

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In a perfectly competitive equilibrium with production and trade, all of the above results occur:
A) Pareto-efficiency is obtained because in a competitive market, resources are allocated to their most efficient use and no further gains can be made without making someone worse off.
B) The First Welfare Theorem is satisfied, which states that if there is a competitive equilibrium, then any Pareto optimal outcome can be supported as a competitive equilibrium outcome.
C) There is efficiency in production, as producers are able to minimize their costs by using the most efficient production techniques and allocating resources to their highest valued uses.

In a Perfectly Competitive Equilibrium with Production and Trade,which of the Following