-The Above Figure Shows a Nation's Production Function

-The above figure shows a nation's production function. Point C is ________ and ________ because ________.

A) unattainable; efficient; the nation would be using resources efficiently if it could attain this level of production
B) attainable; efficient; the nation is using resources efficiently
C) unattainable; inefficient; the nation is using resources inefficiently
D) attainable; inefficient; the nation is using resources inefficiently
E) unattainable; inefficient; the nation is using resources efficiently but it could be more efficient