The factor that would have any effect on our wellness is the number of siblings. So the correct option is A.
The global wellness institute has defined wellness as the "active pursuit of activities, lifestyles and choices that would result in developing a state of holistic health".
Wellness is not a permanent or static state which can be achieved and kept like a possession. It is something a person constantly has to strive to maintain. Thus it is an active pursuit.
Holistic health means the kind of health whose definition extends beyond physical health. It includes many aspects of our life and the constant balance that we also should constantly maintain.
It is something, a person has to work for independently as everyone is responsible for their own lifestyle choices.
Wellness has common elements with health, well-being and happiness but it's not the same as either of them.
Therefore, the correct option is A.
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