Final answer:
Playing a sport is the best option for Maria as it provides both a fun physical exercise routine and a social environment, eliminating concerns related to biking costs, safety, and storage.
Step-by-step explanation:
Maria is searching for an exercise routine that is both fun and can help her socialize. The best option for her, considering the social aspect and the desire to incorporate daily fitness into her routine, would be playing a sport. This activity is a form of physical exercise that not only promotes good health and enhances physical fitness but also provides social engagement and a sense of community.
Playing sports involves aerobic exercise, which is beneficial for cardiovascular health and muscular endurance. Supported by the notion that physical exercise positively correlates with various health outcomes, playing a sport can be an excellent activity to combat loneliness and improve physical health. Moreover, it doesn't involve the costs and risks associated with biking, nor the storage concerns.