Two vessels $A$ and $B$ are connected via a stopcock. Vessel $A$ is filled with a gas at a certain pressure. The entire assembly is immersed in water and allowed to reach thermal equilibrium. After opening the stopcock,the gas from vessel $A$ expands into vessel $B$,and no change in temperature is observed. Which of the following statements is true?
- A$dw \neq 0$
- B$dq \neq 0$
- C$dU \neq 0$
- DThe pressure in vessel $B$ before opening the stopcock is zero.
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