Answer:
A. He will not be strong enough to do what needs to be done to
become king.
Explanation:
According to this speech, Lady Macbeth believes that her husband Macbeth is too weak or lacks the ruthlessness required to take the steps necessary to become king, despite the prophecy from the witches.
So the correct answer is A - Lady Macbeth believes her husband will not be strong or ruthless enough to commit the deeds required to become king, despite the witches' prophecy putting the possibility in front of him.