Appeal means to be attractive or interesting, or to make a serious or urgent request, usually to the public.
It should not be controversial: it would only make the research less reliable since people would have their opinions about the topic that they would want to defend. It should also not be obscure: then it's hard to check.
The best answer is that it should be multifaceted: it should include a number of aspects, not just one, so that the test can check for those aspects, not just one.
<span>"Why do you think Willie Mays was such a good baseball player?" is open-ended.</span>
Answer:
Run-on
Explanation:
The sentence is arguably two, or at least in deservance of a dash. The first sentence ends after 'quickly', and the second begins at 'it'.
