Answer:
Furthermore, animal cognition research tends to eschew questions of which animals are smarter than others, focusing instead on more specific questions like the ones above. Scientists often say that they are more interested in how well an animal evolved to thrive in their environment, rather than in how smart they are.
The answer is C) milky way. Earth lives in the galaxy, which is apart of the milky way.
~Deceptiøn
Maybe, not sure, may need to check yahoo answers for this one