(c) We know that, area of parallelogram is the product of its any side and the corresponding altitude (or height). Here, when AB is base, then height is DL. Area of parallelogram = AB x DL and when AD is base, then height is BM. Area of parallelogram = AD x BM When DC is base, then height is DL. Area of parallelogram = DC x DL and when BC is base, then height is not given. Hence, option (c) is correct.