An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is 5000 m³ and the target dry unit weight is 16.2 kN/m³. Three nearby sites (see figure below) have been identified from where the required soil can be transported to the construction site. The void ratios (e) of different sites are shown in the figure. Assume the specific gravity of soil to be 2.7 for all three sites. If the cost of transportation per km is twice the cost of excavation per m³ of borrow pits, which site would you choose as the most economic solution? (Use unit weight of water = 10 kN/m³)