Question

What is the danger of relying on a series of short, simple sentence to comprise a majority of your sentences within an essay? Short sentences may give your paper a feeling of incompleteness and rushed urgency. The reader may view this as a lack of effort. Short sentences may obscure the connections between ideas. The reader may be confused. Short sentences may create a pattern of emphasis. The reader may mistake details as important information. Short sentences may make the writing unclear and hard to understand. The reader may stop reading.

Answer 1

I think this must be a list of multiple choice answers. 

I would say it's probably the one starting with "Short answers may obscure the connections between ideas"

Answer 2

Assuming that the sentences above are supposed to be multiple-choice options, I think, "Short sentences may obscure the connections between ideas. The reader may be confused," is the best choice. Using more complex sentences is usually necessary to  synthesize ideas.