Dora Has Recently Started Working on a Research Study That

Multiple Choice

Dora has recently started working on a research study that hypothesizes that people who have a defect in a specific gene may have a predisposition to depression.As a second hypothesis in the study,the researcher is studying the impact of a significant lack of social support in triggering the onset of depression in such people.If Dora's research successfully validates both hypotheses,which of the following conclusion may be drawn?

A) A defect in the gene Dora is studying is directly linked to depression.
B) A lack of social support always leads to clinically significant levels of depression.
C) The defective gene and lack of social support produce a heightened risk of depression.
D) The defective is recessive and depression is a result of polygenic inheritance.