Which one is right?
Now a paper in Science argues that organic chemicals in the rock come mostly room ______on earth rather than bacteria on Mars.
A configuration
B constitution
C condemnation
D contamination

Question

Which one is right?
Now a paper in Science argues that organic chemicals in the rock come mostly room ______on earth rather than bacteria on Mars.
A configuration 
B constitution 
C condemnation 
D contamination

Answer

The answer is D, but the question is also a little bit wrong.

I think it should read:

Now a paper in Science argues that organic chemicals in rocks come mostly from contamination on earth rather than bacteria on Mars.

Answer

Danny is correct.