The fact that not everyone will develop an affective disorder after the loss of a loved one is best explained by:

Question

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The Diathesis-Stress Model proposes that the development of a mental disorder is the result of an interaction between a pre-existing vulnerability (diathesis) and environmental stressors. In the case of losing a loved one, some individuals may have a pre-existing vulnerability (such as a genetic predisposition to depression or anxiety), which interacts with the stress of the loss to increase their risk of developing an affective disorder. However, not everyone has this pre-existing vulnerability, and therefore not everyone will develop an affective disorder after the loss of a loved one.

The Fact That Not Everyone Will Develop an Affective Disorder