Final answer:
The passages indicate that social and psychological factors significantly affect an individual's physical condition, thus aligning with option C) social and psychological factors affect our physical condition.
Step-by-step explanation:
The passage suggests that social and psychological factors affect our physical condition, which most closely aligns with option C) social and psychological factors affect our physical condition. It discusses the strain and negative impact on mental health that comes from living on the bounty of one's friends and the associated risk of poverty when one is in a state of dependence. Moreover, it highlights the importance of who controls the family's financial resources, pointing out that when mothers have greater control, there tends to be a positive impact on children's health and familial spending habits that benefit the family more broadly.
Additionally, the excerpts discuss the relationships among people of unequal wealth and the stress from negative aspects of relationships with friends and family. Factors that influence our relationships include economic disparities and control over financial resources within the family. The text also hints at the importance of support systems, though it doesn't explicitly suggest they are mainly made up of relatives, and it does not discuss the author's stance on weddings or relatives offering money. Therefore, the correct response gleaned from the passages would be that the author states that social and psychological factors contribute to our physical condition.