The main conflict described in the excerpt is best represented by the option: Clover feels frustrated at what has happened at the farm and at her inability to stop it.
In the passage, Clover reflects on her disillusionment with the state of Animal Farm, contrasting her hopes for a society of equality and freedom with the reality of fear, violence, and oppression that has emerged. She feels a deep sense of frustration and sadness about the direction the farm has taken, as it diverges sharply from the ideals for which they initially rebelled.