Problems with Liquid Thermometers

Q. The pressure of the gas in a constant volume gas thermometer at steam point (373.15K) is $1.5\times {10}^{4}Pa$. What will be the pressure at the triple point of water ?

1. $1.10\times {10}^{4}Pa$
2. $1.50\times {10}^{4}Pa$
3. $2.10\times {10}^{4}Pa$
4. $2.50\times {10}^{4}Pa$