Answer:
a. has not been able
Explanation:
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Macbeth’s character consistently is revealed as valiant in battle. As of macbeth’s . Lady Macbeth says macbeth is to full of the milk of human kindness to catch the neareast way.
You need an adverb here, as it will modify the verb, not a noun (or is not a predicate) so the correct answer is "well" - option b.