Miss Marple Spends Her Entire Leisure Time Gardening

Miss Marple spends her entire leisure time gardening. She values the marginal utility of the last hour spent gardening at $17. She could earn $20 if she worked an additional hour. Assuming that Miss Marple wants to maximize her utility, which of the following is CORRECT?

A) She should spend more time gardening and less time working to balance the stress of work with the relaxation provided by a hobby.
B) She should spend more time gardening and less time working, since leisure activities are usually characterized by increasing marginal utility.
C) She should reallocate her time away from gardening and toward more work.
D) This question cannot be answered without knowing how many hours she spends working and how many hours she spends gardening.