88. Which of the following species obeys the 18-electron rule?

(A) (η⁵-C₅H₅)₂Fe

(B) (η⁵-C₅H₅)₂Co

(C) (η⁵-C₅H₅)₂Ni

(D) [(η⁵-C₅H₅)₂Ni]⁺

(E) [(η⁵-C₅H₅)₂Fe]⁺

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