Three different liquids are filled in a U-tube as shown in figure. Their densities are $\rho_1, \rho_2$ and $\rho_3$ respectively. From the figure we may conclude that

• A

  $\rho_3=4\left(\rho_2-\rho_1\right)$
• B

  $\rho_3=4\left(\rho_1-\rho_2\right)$
• Correct answer
  C

  $\rho_3=2\left(\rho_2-\rho_1\right)$
• D

  $\quad \rho_3=\frac{\rho_1+\rho_2}{2}$

Hence, the correct answer is option: 'C'.