A body starts from rest and moves with a uniform acceleration. The ratio of the distance covered in the nth second to the distance covered in n second is 

• A

  $\left(\frac{2}{\mathrm{n}}-\frac{1}{{\mathrm{n}}^2}\right)$

• B

  $\left(\frac{1}{{\mathrm{n}}^2}-\frac{1}{\mathrm{n}}\right)$

• C

  $\left(\frac{2}{{\mathrm{n}}^2}-\frac{1}{\mathrm{n}}\right)$

• D

  $\left(\frac{1}{\mathrm{n}}-\frac{1}{{\mathrm{n}}^2}\right)$