If, on a questionnaire, a respondent is asked "what do you feel is the most important crime problem facing the police in your city today? ", they are being asked what type of question?

They are being asked a Closed Question, because this tpe of question requires a specific answer which it could be a "yes", "no" or a specific information. And in this case this question is asking for a specific problem.

c. taught scientists many new things about the earth, but not other planets.

explanation:

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances