​Why Did Most Later Researchers Get Significantly Different Results from the Ones

Multiple Choice

​Why did most later researchers get significantly different results from the ones that Kinsey reported?

A) Kinsey conducted his interviews in crowded public places.
B) ​Kinsey conducted his interviews by telephone.
C) ​Kinsey asked people to describe their friends instead of themselves.
D) ​Kinsey did not study a representative sample of the population.