A 1N pendulum bob is held at an angle $\mathrm{\theta }$ from the vertical by a 2 N horizontal force F as shown in the figure. The tension in the string supporting the pendulum bob (in newton) is

• A

  $\cos \mathrm{\theta }$

• B

  $\frac{2}{\cos \mathrm{\theta }}$

• C

  $\sqrt{5}$

• D

  1