According to "How to Think Like a Researcher," a chapter from How to Find Out Anything, one should begin research by asking answerable questions rather than open-ended questions. Based on the guidelines in the text, which is an appropriate research question?
A
Which state has the most days of nice weather in a year?B
Is a year-round school calendar a better option for students?C
What is the most difficult thing about taking a trip abroad?D
What is the average income of a dentist in the United States?