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In a $U-$ tube experiment, a column $AB$ of water is balanced by a column $‘CD’$ of oil, as shown in the figure. Then the relative density of oil is
  • A$\frac{{{h_2}}}{{{h_1}}}$
  • B$\frac{{{h_1}}}{{{h_2}}}$
  • C$\frac{{\left( {{h_1} - {h_2}} \right)}}{{{h_1}}}$
  • D$\frac{{{h_2}}}{{\left( {{h_1} + {h_2}} \right)}}$
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