Who is responsible for Macbeth’s actions? Himself, his wife, the witches, or a combination?

Macbeth, Lady Macbeth and the three witches are all to blame for the tragedy that is “Macbeth”, Lady Macbeth through convincing Macbeth, Macbeth for following his ambition more than his conscience and the three witches for putting the idea of being king in Macbeth's head.

the correct answers are:

c. “never in the history of his people had a man married a woman who spoke a different tongue.”

d. “‘it has never been heard,’ was the verdict of an old man speaking a few weeks later.”

e. “this man had come with others to commiserate with okeke.”