Carl, a Sociologist, Believes That Love Improves the Well-Being of People

Carl, a sociologist, believes that love improves the well-being of people in a society.He finds that relationships based on love create stable, happy societies.Which of the following statements, if true, is most likely to strengthen Carl's argument?

A) Research indicates that single people are happier than individuals who are engaged or married.
B) Studies show that individuals not involved in any kind of romantic relationship are at a greater risk of using drugs.
C) Research indicates that people with a large social circle exhibited self-destructive behavior.
D) Married couples often suffer from chronic stress which results in a weak immune system.