Thermal properties and temperature — practice question

How large is the temperature gap between the fixed points on the $^{\circ}\text{C}$ temperature scale?

• A$10\,^{\circ}\text{C}$
• B$100\,^{\circ}\text{C}$
• C$110\,^{\circ}\text{C}$
• D$120\,^{\circ}\text{C}$