A rocket with a lift-off mass $3.5\times {10}^4 \mathrm{kg}$ is blasted upwards with an initial acceleration of $10\mathrm{m}/{\mathrm{s}}^2$. Then the initial thrust of the blast is

• A

  $1.75\times {10}^5\mathrm{N}$

• B

  $3.5\times {10}^5\mathrm{N}$

• C

  $7.0\times {10}^5\mathrm{N}$

• D

  $14.0\times {10}^5\mathrm{N}$