Answer E id your best option here. With A, there is no way to have a fallback, a sort of a null hypothesis to your question. Also most research questions aren't yes or no. B is incorrect because if you want an answer you will consider both sides of an issue to draw that conclusion, but the question will not explore both sides. It will want one answer. For C, just because a question is lengthy doesn't mean it's strong. It can be wordy and poorly constructed, making it a poor question. Since it is a research question, it should be very open for debate so as to draw the correct conclusion. If it is not open to debate, it is not a research question. These all make E the best answer. With specific details you can then focus on those and then draw a specific conclusion that better suits your question.
