Which of the Following Habitats Would Most Likely Have a High

Which of the following habitats would most likely have a high proportion of species of plants that are in symbiotic association with nitrogen-fixing bacteria?

A) anoxic soils such as fens and bogs
B) nutrient-limiting soils such as wet tropical rain forests
C) loamy soils such as temperate forests
D) agriculturally productive regions that have gone fallow
E) alpine coniferous forests