Concept:Area of a rectangle is length multiplied by width.Then convert square metres into hectares using 1 ha=10,000 m2.Explanation:Area of the farmland =50 m×25 m=1250 m2.Since 1 ha=10,000 m2, divide the area in square metres by 10,000.1250÷10,000=0.125 ha.Therefore, the area of the rectangular farmland is 0.125 hectares.Answer:0.125 ha, i.e. Option D.