Which Factor(s)contribute(s)to the Emergence of Pesticide-Resistant Crop Pest Populations

Which factor(s) contribute(s) to the emergence of pesticide-resistant crop pest populations?

A) lack of genetic diversity in the pest population
B) the ability of individual pests within a population to survive exposure to the pesticide and reproduce
C) organic farming techniques
D) the ability of pesticide reapplication to kill all pests in a population
E) All of these answers are factors that contribute to the emergence.