Final answer:
Ginny made her owner more caring through her example. (Option B).
Step-by-step explanation:
The main effect of Ginny on her owner can be seen in option B) She made him more caring by her example. Throughout the passages provided, the owner's attitude towards Ginny evolves from indifference to concern and care. For instance, in the last passage, the owner pays no attention to the dogs around him but instead focuses on his thoughts. This highlights a change in his behavior and prioritization of his own emotions. This change in attitude demonstrates Ginny's impact on her owner, making him more caring and compassionate.