When using logic to reach your reader/audience, you are trying to get them to think - use their brain. Not their feelings, or what their opinion may be. You want to use empirical evidence or facts to state what you know. The answer choice I would choose would be answer would be A. A logically tells me that there is more out there and that the ocean floor in all has not been mapped.
Explanation:
B - this is an opinion due to the words, "it feels"
C - lends an air of mystery - still based on what I think it might look like
D - using the word clearly seems to me that they are trying to just convince you of a fact not true evidence.
Only A give the logical answer that we all <em>know</em> that all of the ocean floors have not been mapped.
