In a row of cadets, Harsh is standing at 10th position from right, and Sara is standing at 8th position from left. If they interchange positions, Sara becomes 16th from left. How many cadets are their in the row ?

Question

$\begin{array}{1 1} (A) 29 \\ (B) 31 \\ (C) 26 \\ (D) 25 \end{array} $