When the radius and mass of earth are increased by 0.5%. Which of the following statement is correct at the surface of the earth? 

As we know that,  $g=\frac{GM}{R^2},v_e=\sqrt{\frac{2GM}{R}}$

and                      $U=\frac{-GMm}{R}$

$\therefore g\propto \frac{M}{R^2},v_e\propto \sqrt{\frac{M}{R}}\text{ and }U\propto \frac{M}{R}$

If both mass and radius are increased by 0.5%, then escape velocity and potential energy remains unchanged, whereas g decreases by 0.5%.
Thus, option (a) is correct but rest are incorrect.