Hello there.
Question: What is a way to maintain your social health?
a. be sure to get at least nine hours of sleep each night.
b. take vitamins every day.
c. be a loyal, truthful and dependable friend.
d. take part in regular physical activity.
Answer: It would be C. be a loyal, truthful and dependable friend. All the other options are more related to physical health rather than social health.
As C is the only option related to social health then i presume that would be the answer.
In short, Your answer is C.
Hope This Helps You!
Good Luck Studying ^-^