The resistance of a resistance thermometer has values 2.70$\mathrm{\Omega }$ and 3.70$\mathrm{\Omega }$ at 0°C and 100°C respectively. The temperature at which the
resistance is 3.10$\mathrm{\Omega }$ is

• A

  30°C

• B

  40°C

• C

  60°C

• D

  70°C