Identify the ferromagnetic substance among the given ones

1. A.
   NaCl
2. B.
   $\text{C}_6\text{H}_6$
3. C.
   $\text{CrO}_2$
4. D.
   $\text{H}_2\text{O}$

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1. A.
   NaCl
2. B.
   H$_2$O
3. C.
   O$_2$
4. D.
   CrO$_2$

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1. A.
   $\mathrm{NaCl}$.
2. B.
   $\mathrm{C_6H_6}$.
3. C.
   $\mathrm{O_2}$.
4. D.
   $\mathrm{Gd}$.

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