The U-Tube in the Figure Is Sealed at Both Ends $\times$

Multiple Choice

The U-tube in the figure is sealed at both ends.It contains a gas in A,another gas in B,and mercury in C.The heights of the mercury in the two arms are as shown.The density of mercury is 13.6 g/cm³.If the pressure in A is 1 $\times$ 10⁴ dyn/cm²,the pressure in B is

A) 1 $\times$ 10⁴ dyn/cm²
B) 2 $\times$ 10⁴ dyn/cm²
C) 3 $\times$ 10⁴ dyn/cm²
D) 4 $\times$ 10⁴ dyn/cm²
E) 5 $\times$ 10⁴ dyn/cm²