The total number of rare-earth elements is

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(C) The term $ 	ext{rare-earth elements} $ typically refers to the $15$ lanthanides $( 	ext{Lanthanum to Lutetium} )$ plus $ 	ext{Scandium} $ and $

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$17$

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(C) The term $ 	ext{rare-earth elements} $ typically refers to the $15$ lanthanides $( 	ext{Lanthanum to Lutetium} )$ plus $ 	ext{Scandium} $ and $ 	ext{Yttrium} $,making a total of $17$ elements. However,in many contexts,the $14$ elements from $ 	ext{Cerium} $ $(Z=58)$ to $ 	ext{Lutetium} $ $(Z=71)$ are specifically referred to as the lanthanide series. Given the standard classification,the total count is $17$.

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