Concept:A bulldozer is a heavy machine used for land clearing and earthmoving tasks, not for crop establishment.Explanation:Bulldozers are fitted with broad metal tracks and a front blade. Their main uses include bush clearing, uprooting trees and stumps, and leveling or grading the ground. Planting trees is a delicate farming operation that requires manual labour or specialised planters, not a bulldozer. Therefore, planting of trees is the purpose a bulldozer is not used for.Answer:D. planting of trees