Which of the Following Best Matches the Description

Which of the following best matches the description?
-Organisms that live on the bottom of marine or freshwater ecosystems.

A) phytoplankton
B) littoral zone
C) desert
D) pioneer community
E) grassland
F) boreal forest
G) pelagic
H) tundra
I) none of above
J) benthic
K) deciduous forest
L) biochemical oxygen demand
M) periphyton
N) marsh
O) savanna
P) euphotic