Explanation:

- Egoistic suicide occurs when an individual feels little connection with the society, leading to isolation and lack of support. (Correct Answer)

- Altruistic suicide happens when a person is too integrated into a group, sacrificing themselves for its benefit.

- Anomic suicide results from a breakdown of social norms, often during periods of social or economic upheaval.

- Fatalistic suicide happens when life is over-regulated and hopeless, often due to oppressive discipline.

- The key factor for egoistic suicide is non-integration or detachment from society.