(C) Transition metals of group $7, 8,$ and $9$ do not form hydrides. This is known as the hydride gap. Among the given options,$Fe$ (group $8$),$Mn$ (

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(C) Transition metals of group $7, 8,$ and $9$ do not form hydrides. This is known as the hydride gap. Among the given options,$Fe$ (group $8$),$Mn$ (group $7$),and $Co$ (group $9$) belong to the hydride gap. $Cr$ (group $6$) does not fall into this gap and can form interstitial hydrides.