Answer:
a) Efficiency deals with the size of the economic pie, and equality deals with how fairly the pie is sliced.
Explanation:
In his book; Principles of Microeconomics (Fourth Edition), Gregory Mankiw explains that;
Efficiency refers to how well a society can maximize the benefits it derives from its scarce resources. The "economic pie" in this instance refers to those benefits that can be gotten by the society. A highly efficient society will get more benefits (a larger sized pie), than a society that is not as efficient.
Equity on the other hand refers to how fairly those benefits are distributed among members of the society.