-The Above Figure Shows a Nation's Production Function

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

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