Craig Has One Short Copy and One Long Copy of the Serotonin

Craig has one short copy and one long copy of the serotonin transporter gene.What does this tell us about his vulnerability for major depressive disorder? 

A) It is almost completely certain that Craig will be diagnosed with major depressive disorder at some point during his lifetime. 
B) It is almost completely certain that Craig will not be diagnosed with major depressive disorder. 
C) Craig has a moderate chance of developing major depressive disorder regardless of his lifestyle and exposure to stress. 
D) Craig has a moderate chance of developing major depressive disorder, but this is more likely if he is exposed to severe stress.

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