The inference that best explains why Clover keeps quiet despite how she feels after the slaughter is:
Clover is devastated by the murders but will do whatever it takes to prevent the return of humans.
This response captures Clover's internal conflict: her sorrow over the loss of her friends weighed against her commitment to the cause they fought for. It highlights her sense of duty to the collective welfare of the animals on the farm, despite her emotional distress.