Why Is There Likely to Be a Higher Diversity of Plant

Why is there likely to be a higher diversity of plant species in soil derived from limestone than in soil derived from granite?

A) The higher acidity of soil derived from granite lowers the availability of nitrogen and phosphorus to plants.
B) Limestone attracts more bacteria and fungi, thereby increasing the nutrients in the soil.
C) The higher acidity of soil derived from limestone increases the availability of nitrogen and phosphorus to plants.
D) The lower acidity of soil derived from granite lowers the availability of nitrogen and phosphorus to plants.