A fused sentence is also called a run-on (may make it easier to understand what this is) This only occurs when a writer has connected two main clauses with no punctuation. Example: I have a animal pet fred who I love so much he is my most prized possession says mom. <span />
I think that the answer is D(We stopped, although we could have kept going.)
Coherence is meaning <u><em>that the quality of being logical and consistent. </em></u>
<em>Hope this helps you out</em>