A body of fundamental principles or established precedents according to which a state or other organisation is acknowledged to be governed
The answer is push theory, it is because a push theory is a means of having something for an individual to strive or to be motivated into reaching his or her goal; for it to be considered as a pull theory, the individual should move on its own without having any rewards or factors moving him or her to a certain goal.
Crassus joined forces with two other men in 60 B.C. to form a political alliance that would come to dominate Rome: the so-called First Triumvirate. Alongside Crassus stood Gaius Julius Caesar, an ambitious military commander beginning a life in politics.