The Classical Theory Was Developed in the Late 18th and Early

The classical theory was developed in the late 18th and early 19th centuries

A) and therefore is not accepted today.
B) during a time of population decline.
C) and has proponents today who fear population growth and overpopulation.
D) and can not be explained using the modern tool of the production function.
E) and still applies to the most developed nations today, though not to the less developed nations.