What Factors Are Not Accounted for When Using Probability Sampling

What factors are not accounted for when using probability sampling?

A) each member of the populations has a known chance of being selected
B) knowing that each member of the population has a chance of being selected allows the researcher to generalize back to the population
C) there is less need to be careful in the sample selection when the population is homogenous
D) when the population is homogeneous there is a greater need to use probability sampling than when the population is heterogeneous