Final answer:
The 1500 meter run is the primarily aerobic activity out of the provided options, as it involves sustained physical effort over a distance, requiring oxygen for the aerobic energy generation process.
Step-by-step explanation:
The activity that is primarily aerobic among the choices provided is the 1500 meter run. Aerobic exercise, often referred to as cardio, is characterized by prolonged physical activity powered by the aerobic energy-generating process, which means it requires oxygen to meet the body's energy demands during exercise. In contrast to anaerobic activities, which involve short bursts of intense activity like weightlifting or sprinting, aerobic exercise includes activities such as long-distance running, cycling, and swimming, which require sustained effort over a longer period.