Answer:
Option C: Curiosity
Explanation:
Sear means (of pain) be experienced as a sudden, burning sensation. Hence the excerpt explains about the resemblance of Banquo. The crown, hair and eye brows look exactly like Banquo. At first, the reader may experience it like horror, but this phrase, "Why do you show me this?—A fourth? Start, eyes! What, will the line stretch out to th' crack of doom?" changes the tone from horror into curiosity.