Failyre of Plurality

"Spoiler effect" -- in both profiles 60 citizens prefer B to A, 
Profile
P1
40
Citizens		 35
Citizens		 25
Citizens
First
Choice
A
 B B
Second
Choice
B
 A C
Last 
Choice
C
 C A
B wins by 60% majorityy
      
Profile
P2		 40
Citizens		 35
Citizens		 25
Citizens
First 
Choice		 A B C
Second
Choice		 B A B
Last
Choice		 C C A
A wins with 40% plurality

Plurality fails Independence of Irrelevant Alternatives since each citizen's pairwise ranking of alternatives A and B in profile 2is the same as it is in profile 1, but A and B are NOT in the same order in the two social preference orderings.  The same 40 people prefer A to B and the same 90 people prefer B to A pairwise in both profiles.