Answer:
D. Darkness
Explanation:
MACBETH. Stars, hide your fires / Let not light see my black and deep desires.
Macbeth is invoking darkness for the purpose of hiding his "black and deep desires."
LADY MACBETH. Come, thick night, / And pall thee in the dunnest smoke of hell, / That my keen knife see not the wound it makes.
Lady Macbeth is beckoning the night to obscure her form "That [her] keen knife sees not the wound it makes."