I believe the answer is: Temperament
Temperament would very much determine how an individual react under certain circumstances.
For example, someone with high temper could easily display aggressive behavior with very little provocation, while the others could maintain calm and collected attitude in the middle of a chaos.<span />
It depends on what person
1. Lazy military
2. People who don't care
3. Very bad president
The correct answer is "provide for the common defence."
According to the Preamble of the U.S Constitution, the aforementioned part about providing for the common defence actually means that the nation should be well prepared against foreign interventions of any kind.
This kind of preparation does not only refer to military preparation but also refers to protecting the country at any costs from external forces.
Answer: C.) Yang Jian, Sui dynasty
Explanation: Yang Jian took control of the Northern Dynasty. He established the Sui Dynasty and became known as Emperor Wen.