A Bacterium That Infects a Fly Causes It Harm and Is

A bacterium that infects a fly causes it harm and is completely dependent on the fly for survival and reproduction.Over time,however,adaptations by both the fly and the bacterium decrease the negative effects of the bacterium on the fly.We can thus say that the relationship has evolved from parasitism toward

A) commensalism.
B) amensalism.
C) mutualism.
D) a consumer-resource interaction.
E) herbivory.