$A$ rectangular loop carrying a current $i$ is placed in a uniform magnetic field $B$. The area enclosed by the loop is $A$. If there are $n$ turns in the loop,the torque acting on the loop is given by

• A
  $ni\,\overrightarrow{A} \times \overrightarrow{B}$
• B
  $ni\,\overrightarrow{A} \cdot \overrightarrow{B}$
• C
  $\frac{1}{n}(i\overrightarrow{A} \times \overrightarrow{B})$
• D
  $\frac{1}{n}(i\overrightarrow{A} \cdot \overrightarrow{B})$