$A$ conducting bar of length $L$ is free to slide on two parallel conducting rails as shown in the figure. Two resistors $R_{1}$ and $R_{2}$ are connected across the ends of the rails. There is a uniform magnetic field $\vec{B}$ pointing into the page. An external agent pulls the bar to the left at a constant speed $v$. The correct statement about the directions of induced currents $I_{1}$ and $I_{2}$ flowing through $R_{1}$ and $R_{2}$ respectively is:

• A
  Both $I_{1}$ and $I_{2}$ are in anticlockwise direction.
• B
  Both $I_{1}$ and $I_{2}$ are in clockwise direction.
• C
  $I_{1}$ is in clockwise direction and $I_{2}$ is in anticlockwise direction.
• D
  $I_{1}$ is in anticlockwise direction and $I_{2}$ is in clockwise direction.