Which would be the best concluding sentence for this paragraph?

C. These similarities and differences make the presence of life on Mars a possibility.

Explanation:

this sentence^ is the best conclusion for the paragraph. the other ones do not make as much sense.

early in the paragraph, we can read the sentence: There is, therefore, a likelihood that life may exist there in the future.

it states the same idea as answer c.

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the maximum speed limit is 55 mph on a two-lane undivided highway and for vehicles towing trailers.