Cause and effect: Consequently, therefore, accordingly, as a result, because, for this reason, hence, thus...
Sequence: Furthermore, in addition, moreover, first, second, third, finally, again, also, and, besides, further, in the first place, last, likewise, next, then, too, etc.
The most logical answer would be A. "The author states that animals and humans share 98 percent DNA." The author is explaining the genetics of animals and humans. please correct me if i'm wrong!!