This question contains Statement $-1$ and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement - I: For a mass $M$ kept at the centre of a cube of side ' $a$ ', the flux of gravitational field passing through its sides is $4 \pi$ GM. and Statement - II If the direction of a field due to a point source is radial and its dependence on the distance ' $r$ ' for the source is given as $1 / r^2$, its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface

• A

  Statement $-1$ is false, Statement $-2$ is true.
• Correct answer
  B

  Statement $-1$ is true, Statement $-2$ is true; Statement $-2$ is correct explanation for Statement-1.
• C

  Statement $-1$ is true, Statement $-2$ is true; Statement $-2$ is not a correct explanation for Statement-1.
• D

  Statement $-1$ is true, Statement $-2$ is False.

Hence, the correct answer is option: 'B'.