King Lear's statement "she hath tied sharp-tooth'd unkindness, like a vulture, here!" suggests that Goneril has viciously attacked him, preying on his kindness and generosity. The imagery of a vulture, which is often associated with scavenging and feeding on the weak or dying, emphasizes the predatory nature of Goneril's actions and the deep emotional pain she has caused him. Therefore, the correct interpretation is:
2. Goneril has preyed upon his sincere generosity by viciously attacking him.