What can you infer about macbeth's character from his hesitation to murder the king?

a. macbeth has both good and bad qualities, but ambition and his wife's arguments are influencing him.
b. macbeth is weak and lacks strength of character because he refuses to come to a quick decision.
c. macbeth has no good qualities and has long been looking for an excuse to kill the king.
d. macbeth is careful and wants to be sure that his role in the crime is never uncovered.