C. 14th
Feedback Since Kashish and Mona interchange places, so Kashish's new position (13th from left) is the same as Mona's earlier position (6th from right). So,number of children in the queue = (12 + 1 + 5) = 18. Now, Mona's new position is the same as Koshis's earlier position i.e. fifth from left.