Why Are Farm Workers in Developing Countries Especially Vulnerable to Pesticide

Multiple Choice

Why are farm workers in developing countries especially vulnerable to pesticide poisoning? 

A)  The workers tend to lack suitable training and protective equipment. 
B)  There are more pests that require pesticide spraying. 
C)  The climate makes pesticides more persistent than when they are applied in developed countries. 
D)  The workers are in a gene pool that makes them particularly susceptible to the effects of pesticides.