The density of a substance at $0^o$C is 10 g/c.c. and at 100°C its density is 9.7g/c.c. The coefficient of linear expansion of the substance is.

• A

  ${10}^4{/}^{\circ }\mathrm{C}$

• B

  $3\times {10}^{4/0}\mathrm{C}$

• C

  $6\times {10}^{-4}{/}^{\circ }\mathrm{C}$

• D

  $9\times {10}^{-4}{/}^0\mathrm{C}$