Which of the Following Best Matches the Description

Which of the following best matches the description?
-Nutrient needed in extremely small amounts for plant growth.

A) weed
B) biocide
C) pheromone
D) macronutrient
E) organophosphate
F) rodenticide
G) auxin
H) chlorinated hydrocarbon
I) weed.
J) hard pesticide
K) soft pesticide
L) persistent pesticide
M) micronutrient
N) biomagnification
O) fungicide
P) herbicide
Q) macronutrients
R) micronutrients