Which of the Following Best Illustrates the Place Theme

Which of the following best illustrates the place theme?

A) Tropical rain forests have species of plants that are believed to have medicinal value.
B) Tropical rain forests are located between the Tropic of Capricorn and the Tropic of Cancer.
C) Tropical rain forests receive so much rainfall that the nutrients of the soil are washed away. Nutrients for plants come from the leaves of the larger trees not the soil.
D) Not all of the plants and animals of the tropical rain forests have been discovered and named by scientists.