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