Based on the options given, the best inference about Rachel when she sees the Chihuahua running through her yard could be D: She is filled with worry for the safety of the animal. This response suggests a concern for the dog's well-being, especially if it is running loose.
However, without more context or specific details about Rachel's reaction, it's difficult to definitively choose one option over the others. If Rachel's demeanor and thoughts lean more towards concern for the dog's safety, option D would fit best. If she seems surprised or annoyed, then option B or C could also be plausible.