Which of the following is a common treatment for flea infestations?

Flea medications and baths are common treatments for flea infestations because they are specifically designed to eliminate fleas and prevent their return. Flea medications come in various forms, including topical treatments, oral tablets, and collars, which work through different active ingredients to either kill fleas on contact or disrupt their life cycle. Baths can also help remove fleas from a pet's fur and skin and can be used in conjunction with medications for added effectiveness. This comprehensive approach helps in addressing not just the adult fleas, but also larvae or eggs that may be present in the environment.

Other options like antibiotics, increased feeding, and regular exercising do not address the problem of fleas directly. Antibiotics are medicines used to treat bacterial infections and have no effect on fleas. Increased feeding does not influence flea populations or mitigate infestations, and while regular exercising is beneficial for a pet's overall health, it is unrelated to flea control.