Which of the following took place at the beginning of genghis khan's role in the rise and expansion of the mongol empire?

a genghis khan defeated the mongol chieftain to gain control of the empire.

b genghis khan united several tribes of the mongolian plateau.

c genghis khan invaded china, placing many cities under siege.

d genghis khan gained control of the silk road.

Can you summarize this? it takes time and caution to perfect anything which must be concealed. it takes time to crush men who are pursuing legitimate trade. but one of mr. rockefeller’s most impressive characteristics is patience. there never was a more patient man, or one who could dare more while he waited. the folly of hurrying, the folly of discouragement, for one who would succeed, went hand in hand. everything must be ready before he acted, but while you wait you must prepare, must think, work. "you must put in, if you would take out." his instinct for the money opportunity in things was amazing, his perception of the value of seizing this or that particular invention, plant, market, was unerring.