Normal reaction on the block is ......... if the block is as shown in the figure.

• A

  $\mathrm{F}+\mathrm{Mgcos}\mathrm{\theta }$

• B

  $\mathrm{F}-\mathrm{Mgcos}\mathrm{\theta }$

• C

  $\mathrm{Mgcos}\mathrm{\theta }-\mathrm{F}$

• D

  $\mathrm{Mgcos}\mathrm{\theta }+\mathrm{F}$