The correct answer is belief.
A philosophical assumption means that the philosopher just assumes, or believes something to be true, without any concrete evidence. The moment he or she is able to provide proof to support his or her assumption, it becomes a law because it can be checked if necessary.
The trait prominent in Macbeth's character in Acts I and II of Macbeth is ambition. He is ambitious in the beginning, and wants to prosper and be a better soldier. His murders and hatred come later on.
