Final answer:
The correct answer is Warm water hydrotherapy, which is suitable for people with FOP to engage in exercises that are gentle on the joints and help maintain mobility and muscle strength.
Step-by-step explanation:
The style of therapy that can be used to help people with FOP (Fibrodysplasia Ossificans Progressiva) engage in active range of motion, cardiopulmonary, and resistive exercise in a safe, low-impact environment is Warm water hydrotherapy. This form of exercise is beneficial for individuals with conditions like osteoarthritis (OA) as it helps to maintain joint mobility and strengthen muscles, which in turn helps keep the bones in joints correctly aligned, reducing joint stress. Activities like swimming, water aerobics, and biking are especially recommended because they place relatively little stress on the joints.