All the options listed—walking, bicycling, hiking, and leisurely paced swimming—are generally considered low-intensity cardiovascular activities. However, if you have to choose one that might be seen as higher intensity depending on the context, one could argue that C. Hiking could sometimes be less low-intensity compared to the others, as it can vary greatly in difficulty based on the terrain and elevation.
That said, for consistent understanding, all of the listed options can be low-intensity activities. If you're looking for a definitive answer, please clarify any specific context in which one might be considered differently.
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