Number of colourless lanthanoid ions among the following is

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Ions	Electronic configuration	$f - f$ transition	Colour
${Eu}^{3 +}$	${}_{54}{[Xe]} 4 f^{6}$	possible	Coloured
${Lu}^{3 +}$	${}_{54}{[Xe]} 4 f^{14}$	Not possible as there are no unpaired $f$ electrons	Colourless
${Nd}^{3 +}$	${}_{54}{[Xe]} 4 f^{3}$	possible	Coloured
${La}^{3 +}$	${}_{54}{[Xe]} 4 f^{0}$	Not possible as there are no $f$ electrons	Colourless
${Sm}^{3 +}$	${}_{54}{[Xe]} 4 f^{5}$	possible	Coloured