It Is Clearly Established That Obesity Has Greatly Increased in Children

It is clearly established that obesity has greatly increased in children over the last several decades in the United States. While several genes have been identified that increase the potential for obesity, environmental influences are also involved. Which of the following is most likely?

A) There is little or no gene-environment interaction.
B) Phenotypic variation is discontinuous.
C) There is a small overlap of phenotypic ranges of different genotypes.
D) There is a wide range of phenotypes with each genotype.
E) There is a demonstrable threshold of environmental effects.