Imagine that you have been given the job of setting aside habitat to preserve the diversity of birds in a swath of lowland rainforest. Three plans have been proposed, each of them totaling 200 km2. Plan A consists of 20 small, scattered reserves. Plan B is one large reserve. Plan C is five medium-sized reserves connected by corridors. Which of the following do you think ranks the reserves in order of potential biodiversity, highest to lowest?