D.becuse it's seems the answer
The meaning of this quote "A leader is best when people barely know he exists; when his work is done, his aim fulfilled, they will say; we did it ourselves" means if the leader is unknown to many people once he has finished or achieved a remarkable goal other people (such as Laozi) can steal the glory and be remembered for something they didn't do.
The gravity of Jupiter helps the comets from hitting the earth
By far the most financially profitable West Indian colonies in 1800 belonged to Britain. The handful of British individuals who became planters made small fortunes. This advantage was reinforced when France lost its most important colony, Saint Dominigue (now Haiti), to a slave revolt in 1791.
