B. Explaining how Hannah would care for the horses.
Explanation:
This would be the best revision to the narrative because it would explain Hannah's love for horses in more detail. It would show how she loves the horses by explaining how she cares for them.
All the other revisions are more or less so irrelevant, as the point of the narrative is to explain Hannah's love of horses.
This is process of painting the opponent as a soft criminal, immersed in his self interest, dishonest and corrupt candidate who is going to be a danger to the nation.