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option D

given P3=P

       => P(P2-I)=0

       => |P|=0   and   |P2-I|=0 (if multiplication of 2 matrix is 0,then determinant of individual 2 matrixes are 0)

|P|=0 => so one eigen value of P is 0.

|P2-I|=0  => so one eigen value of P2 is 1.We know that if λ is eigen value of P,then λ2 is eigen value is P2.Here λ2=1.So λ=1 and λ = -1.

so 3 eigen values are 0,1,-1

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