Mercury is poured in a U-tube. Temperature of one side is `50^(@)C` and level of mercury on this side is `h_(2)`. Temperature of the other side of `100^(@) C` and level of mercury on this side is `h_(2)`. Then
A. `h_(1) = h_(2)`
B. `h_(2) lt h_(1)`
C. `h_(2) gt h_(1)`
D. `h_(2) = 2h_(1)`