Arrow's impossibility theorem tells us:
A. political pressures will always corrupt a voting system, making none ideal.
B. no voting system can aggregate the preferences of voters of three or more options while meeting all of the criteria for an ideal system.
C. most voting systems meet the criteria for an ideal system, yet politicians cannot seem to change the way in which elections are held.
D. no voting system can ever attain all four criteria for an ideal voting system.
Answer: B
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