Answer:
Additionally
Step-by-step explanation:
They all let you know that more information is coming, but additionally means that what is coming is added on to a point stated before. The others, like however, therefore, and note that, all point out that the point is unrelated. C, contrasts the point originally stated, D is telling you that this is a concluding point, and A means that the idea coming up is note worthy. Hope I helped and provided insight :)