A liquid seals air inside a glass tube. When the tube is placed horizontally, the trapped air has a length of $50\text{ mm}$ and a pressure of $1.0 \times 10^5\text{ Pa}$. When the tube is set upright with the closed end at the bottom, the trapped air length becomes $45\text{ mm}$. The temperature of the air stays constant. What is the pressure of the trapped air in the upright position?
- A$0.50 \times 10^5\text{ Pa}$
- B$0.90 \times 10^5\text{ Pa}$
- C$1.1 \times 10^5\text{ Pa}$
- D$1.9 \times 10^5\text{ Pa}$