Some Researchers Have Suggested That Adopting Households Might Show Less

Some researchers have suggested that adopting households might show less variability in many characteristics (e.g. ,parental warmth,parental strictness,parental education,etc. ) than do households in general.If these characteristics really are less variable in adopting households,then what would this mean for estimates of common environment influences on traits?

A) Common environment influences would sometimes be overestimated and sometimes be underestimated.
B) Estimates of common environment influences would not be affected.
C) Common environmental influences would be overestimated.
D) Common environmental influences would be underestimated.
E) The question is meaningless because common environment influences are not estimated using adoption designs.