As Much as 90% of Forest Trees Require Mycorrhizae for Growth

Multiple Choice

As much as 90% of forest trees require mycorrhizae for growth, suggesting that:

A) forest soils are rich in phosphorous
B) mycorrhizae are found everywhere
C) the plant-mycorrhizal association is ammensalic
D) mycorrhizae significantly increase the uptake of nutrients
E) forest trees do not have deep roots