Final answer:
Mentally healthy individuals are more prone to marry due to social selection, a phenomenon where desirable traits make them more attractive partners.
Step-by-step explanation:
The explanation suggests that mentally healthy people are more likely to get married than mentally unhealthy persons due to A) Social selection. This concept relates to how individuals with certain desirable traits such as good mental health are more likely to find a partner and get married. Social selection can be a reflection of how social status, stress, and access to healthcare interplay to affect an individual's life. High social status often correlates with better access to resources, less stress, more control over one's life, and consequently, better mental health. These factors enhance an individual’s social health, which in turn may make them more likely to engage in life events like marriage. Conversely, those with lower social status often face greater stress and resource inequality, which can adversely affect their mental health, making them less likely to marry.