Concept:The number of yam setts is obtained by dividing the total land area by the area occupied by each sett.Explanation:One hectare of land is equal to 10,000m2.The spacing of 1.0m×1.0m means each yam sett occupies an area of 1.0m2.Number of setts is calculated as:Number of setts=1.0m210,000m2=10,000 setts.Thus, at a spacing of 1.0m×1.0m, a hectare of land can contain 10,000 yam setts.Answer:D. 10,000 setts