Based on sentence fluency, transitions, and writing conventions, which conclusion

Based on sentence fluency, transitions, and writing conventions, which conclusion most needs revision?

a.finally, scientists continue to argue their cases for and against a manned mission to mars. however, an eventual mission seems likely.

b.in the end, there are logical pros and cons for a manned mission to mars. it seems its more a matter of when it will happen than if it happens.

c.in conclusion, there are good arguments for and against a manned mission to mars. but based on the evidence, it seems as though a manned mission is likely.

d.overall, scientists continue to debate the pros and cons of a manned mission to mars. yet despite their indecision, it seems almost certain that a mission will happen.

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