The Greater the Elasticity of Supply of and Demand for a Good

The greater the elasticity of supply of and demand for a good, the

A) smaller will be the efficiency loss of an excise tax on the good.
B) more likely the good will be a public good rather than a private good.
C) larger will be the efficiency loss of an excise tax on the good.
D) larger will be the proportion of an excise tax on the good that will be shifted forward to consumers.