Which of the Following Best Matches the Description

Which of the following best matches the description?
-Competition between members of the same species.

A) denitrifying bacteria
B) herbivore
C) omnivore
D) producer
E) trophic level
F) community
G) ectoparasite
H) limiting factor
I) none of above
J) secondary consumer
K) nitrogen cycle
L) biomass
M) habitat
N) carbon cycle
O) interspecific competition
P) nitrogen-fixing bacteria
Q) intraspecific competition