Each of the factors you mentioned can be associated with mental illness, and they all play different roles in its development. To answer your question:
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Hereditary: Genetic factors are known to contribute to the risk of developing mental illnesses. Some mental health conditions have a hereditary component, making this a significant factor.
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Virus infections: There is research that suggests certain viral infections can potentially play a role in the onset of some mental health disorders, though this relationship is less well understood compared to other factors.
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Physical factors: This category can include a variety of issues, such as brain injuries, chronic illnesses, or neurological conditions that can impact mental health.
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Early experiences: Adverse childhood experiences, trauma, and early attachment issues can significantly influence mental health later in life.
Given these considerations, if you're looking for a factor that is less directly associated with mental illness compared to the others, you might choose b. Virus infections, as the relationship is not as strong or well-defined as the others. However, it's important to note that all of these factors can contribute to mental health in different ways.