Which of the Following Ecological Communities Has the Greater Ecological

Which of the following ecological communities has the greater ecological diversity?

A) the bottom dwellers of a small pond that includes 12 species of bacteria, 10 species of protists, 3 species of fungi, 13 species of invertebrate animals, and 1 species of fish
B) a small lawn with 2 species of pine trees, 1 species of squirrel, 1 species of grass, and 8 species of invertebrate animals
C) a large, deep, cold lake with 2 species of aquatic plants, 6 species of phytoplankton, 4 species of protozoans, 3 species of invertebrate animals, and 4 species of fish
D) a field with 3 species of bacteria in the soil, 5 species of grasses, 6 species of invertebrate animals, 2 species of birds, and 1 species of mammal