This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to be single and happy
Consider the health benefits of being single.
Being single is associated with a decreased risk of adverse health effects from dysfunctional marriages or intimate relationships. Some studies have shown that bad relationships can actually make you physically unhealthy.

Options are:
(a). Many parkinson's patients may start their long term lives just as successful as they did before being single. There are other benefits to being single, such as lower risk marriages and less stressful marriages..
(b). This only applies to relationships with a person you have a lot of control over. Individuals who have previously made good relationships and are now very open about wanting to change their relationship may report a decrease in sex drive and lower overall libido levels..
(c). But singles are more likely to be fit and healthy. Singles also tend to go to the gym more, eat better, and have lower stress levels..
(d). Sometimes having a bad social circle or a lack of social support can make those relationships worse. If you know your family and have more friends than you do, you might consider a divorce..
The answer is:
(c).