(C) The actinide series consists of elements with atomic numbers from $89$ to $103$.$Pa$ (Protactinium,$Z=91$),$Lr$ (Lawrencium,$Z=103$),and $Pu$ (Plu

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(C) The actinide series consists of elements with atomic numbers from $89$ to $103$.$Pa$ (Protactinium,$Z=91$),$Lr$ (Lawrencium,$Z=103$),and $Pu$ (Plutonium,$Z=94$) are all members of the actinide series.$Nd$ $(Z=60)$ and $Pr$ $(Z=59)$ are lanthanides.$Lu$ $(Z=71)$ is a lanthanide.Therefore,the correct set containing only actinides is $Pa, Lr, Pu$.