Question

Which factor is a key component of health? 1 national 2. environmental 3. professional 4. social

Answer 1

i believe the answer is: 4. Social

Social component refers to how well a person to develop positive relationship with other people around that person.

Having positive social relationship will lead to higher self esteem, decreasing risk of depression , and higher tendencies to do something positive in their life(including adopting healthy lifestyle)

Answer 2

Answer - Social 
Having friends to be supported by and put a smile on your face is always positive towards your health. 
Without a social life, feelings of depression and loneliness negatively affect your health:(

love, the Pineapple.