Which of the Following Is the BEST Example of an Effective

Multiple Choice

Which of the following is the BEST example of an effective question on a mail survey?

A) Do you believe the synergy of the indigenous population has created a precursor to ecological disaster?
B) Why do you think dogs make good pets and cats make poor pets?
C) Have you ever put food out for wild birds?
D) What is the economy of scale achieved by the transference of heat through solar cells?
E) Will you be buying a new car soon and will it be a foreign car?