A steel tape is placed around the earth at the equator. When the temperature is 0°C neglecting the expansion of the earth, the clearance between the tape and the ground if the temperature of the tape rises to 30°C, is nearly $\left({\mathrm{\alpha }}_{\text{stteel }}=11\times {10}^{-6}/\mathrm{K}\right)$

• A

  1.1 km

• B

  0.5 km

• C

  6400 km

• D

  2.1 km