General formula of a lanthanoid hydroxide

1. A.
   Ln(OH)
2. B.
   Ln(OH)$_2$
3. C.
   Ln(OH)$_3$
4. D.
   Ln(OH)$_4$

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1. A.
   $\ Ln(OH)$
2. B.
   $\ Ln(OH)_{2}$
3. C.
   $\ Ln(OH)_{3}$
4. D.
   $\ Ln(OH)_{4}$

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