Which of these scenarios represents an example of habitat mutualism?

A) Bees travel among flowers, obtaining nectar and pollinating the plants.
B) Ants protect treehoppers from predators and receive honeydew as food.
C) Clownfish live among sea anemone tentacles and protect them from predators.
D) Mycorrhizae provide plants with phosphorus; plants provide microrrhizae with carbohydrates.