Final answer:
The best response is that the pregnant patient should continue her exercise program, as it tends to be beneficial during pregnancy, provided there are no health complications that suggest otherwise.
Step-by-step explanation:
The appropriate nursing response to a pregnant patient who swims 3-5 times a week and is asking whether to stop this activity would be option B: "You should continue your exercise program because it would be beneficial." Regular exercise during pregnancy is generally supported by healthcare providers due to its benefits for both mother and baby, which include improved cardiovascular fitness, muscle tone, and mood, as well as potentially easier labor and delivery. However, it's important for the patient to consult with her healthcare provider to ensure her excercise routine is safe for her particular pregnancy and to account for any individual health considerations.