One end of a string of length $l$ is connected to a particle of mass $m$ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in a circle with speed $v$,the net force on the particle (directed towards the center) will be ($T$ represents the tension in the string).

• A
  $T - \frac{mv^2}{l}$
• B
  $0$
• C
  $T$
• D
  $T + \frac{mv^2}{l}$