The correct answer is D. hurt intensely.
The phrase “cut to the quick” means to be deeply hurt or wounded, especially emotionally. In this case, the old man is deeply hurt by his son’s refusal to recognize him. This is because the old man has likely raised his son and cared for him for many years, and he is now being rejected by his own flesh and blood. This can be a very painful experience, and it is understandable that the old man would be hurt intensely.
The other options are not as accurate. Option A, irritated, means to be slightly annoyed or impatient. This does not seem to be the case with the old man, who is clearly deeply hurt by his son’s actions. Option B, annoyed, means to be somewhat angry or irritated. This is also not as accurate as option D, as the old man seems to be more than just annoyed. Option C, surprised, means to be astonished or amazed. This is also not as accurate as option D, as the old man does not seem to be surprised by his son’s actions. He is likely hurt and disappointed, but not surprised.