During the Later Stages of Succession, the Nutrient Most Limiting

During the later stages of succession, the nutrient most limiting to primary production in many terrestrial ecosystems is _______ because it _______.

A) nitrogen; takes a long time to accumulate in the soil
B) phosphorus; undergoes occlusion over time
C) nitrogen; undergoes chemical reactions with phosphorous over time
D) phosphorus; is very soluble and easily leeched from the soil