Because Root Systems at Different Depths in a Given Area

Because root systems at different depths in a given area of soil capture nutrients and soil efficiently we can say that

A) polyculture lessens the need for fertilizer
B) polyculture lessens the need for fertilizer and water
C) polyculture increases the need for fertilizer but not water
D) polyculture increases the need for water but not fertilizer
E) polyculture lessens the need for pollinators