Use the Following to Answer Questions

Use the following to answer questions :
There are two species of microbes,A and B,which can be grown together or separately.If G_A is the per capita growth rate of species A,G_B is the per capita growth rate of species B,D_A is the density of species A,and D_B is the density of species B,the per capita growth rates for each are:
G_A = 0.14 - 0.006 D_A - 0.04 D_B
G_B = 0.05 - 0.008 D_B + 0.009 D_A
-The interaction between species A and B most closely resembles

A) competition.
B) a consumer-resource interaction,where A is the resource and B is the consumer.
C) a consumer-resource interaction,where B is the resource and A is the consumer.
D) mutualism.
E) commensalism.