A sheet has been folded in the manner as shown in X, Y, and Z respectively and punched. You have to choose from the alternatives how it will look when unfolded.
Since Nithya and Suganya exchange places, so Rita’s new position is the same as Monika’s earlier position. This position is 17th from the right and 10th from the left. Therefore Number of girls in the row = (16 + 1 + 9) = 26.