<em>Sympathetic</em> is the correct option.
The character, Lizabeth, is an adult and she is remembering Miss Lottie's house. As an adult, Lizabeth can see the house with different eyes and understand why the woman kept the house in such a bad condition. This was because of the Great Depression that hit the U.S during the 1930's. The character's sympathetic tone can be noticed when she said there was a sort of <em>enchantment stronger that the elements</em> that had kept the house throughout the years.
These optionsa re not right:
-hopeless: Lizabeth was a girl during the Great Depression and she was not hopelss. When she became and adult ,she understood why Miss Lottie kept marigolds in her ruined house. The flowers meant " hope".
-bitter. In this excerpt, the tone is sympathetic. Lizabeth was angry when she was a girl.
-humorous: The character does not sound funny. There is nothing funny in her words.