阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。
Study finds being sociable is good for your health, while loneliness is as bad for you as smoking 15 cigarettes a day.
A circle of close friends and strong family ties can improve a person’s health more than exercise, losing weight or quitting cigarettes and alcohol, psychologists say. Sociable people seem to benefit extra rewards from their relationships by feeling less stressed, taking better care of themselves and having less risky lifestyles than those who are more lonely, they say.
A review of studies into the effect of relationships on health found that people had a 50% better survival rate if they belonged to a wider social group, be it friends, neighbors, relatives or a mix of these.
