BITSAT 2018 Slot 2 Solved Paper

The two sets of m parallel lines along with two sets of two parallel lines of the given parallelogram will form two sets of (m+2) parallel lines. Each parallelogram is formed by choosing two parallel lines from each of the above
∴ Total number of parallelograms
=‌m+2C2×‌m+2C2=(‌m+2C2)2
Hence, option (c) is correct.