When Comparing the Standard Models in the Respective Fields of Economics

When comparing the standard models in the respective fields of economics and psychology, it is clear that:

A) both economists and psychologists always assume that people behave in a fully rational way.
B) both economists and psychologists always assume that people do not act in a fully rational way.
C) neither economists nor psychologists always assume that people behave in a fully rational way.
D) economists generally assume that people behave in a rational way, whereas psychologists generally do not.
E) psychologists generally assume that people behave in a rational way, whereas economists generally do not.