Final answer:
Clarissa pities Miss Kilman's situation and wants to help her.
Step-by-step explanation:
Based on the provided information, it can be inferred that Clarissa feels pity towards Miss Kilman and wants to help her. In the given passage, Clarissa expresses her empathy for Miss Kilman's situation and wishes she had visited her more often. These feelings suggest that Clarissa is sympathetic and compassionate towards Miss Kilman, indicating that option b, 'pities her situation and wants to help her,' is the correct answer.