Research has suggested that social isolation increases the risk of illness by the same amount as smoking a pack of cigarettes a day. This finding supports the idea that the need for is a fundamental adaptive motive.

Belonging.

Explanation:

Belongingness can be defined as a human's emotional need of being accepted and supported by members of a group. This desire of belonging may be in a group of peers, school, college, office, etc.

Psychologists Baumeister and Leary in 1995, suggested a theory on belongingness, which suggests that belongingness helps a person to maintain a minimum amount of positivity.

They asserted that when a person is denied this belongingness, they tend to witness a decrease in the level of health, happiness, and positivity. They begin to develop the risk of disease and sickness.

So, the correct answer is belonging.

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answer; collective security;