What Other Weakness Can Be Found in the Davis-Moore Theory

What other weakness can be found in the Davis-Moore theory?

A) Such real-world considerations as nepotism and favoritism did not factor enough into how functions are actually assigned and rewarded.
B) The lack of opportunity there really is for the lower strata.
C) Davis and Moore simply wanted to present a utopia, a goal for society, much as Marx did.
D) The determinants of reward and function are ultimately corrupted over time and societies collapse.