After reviewing 42 houses, which option is least likely for Tom regarding his broker Mary?

The least likely option for Tom regarding his broker Mary is to sue in order to compel her to show him more houses. In real estate, brokers have a fiduciary duty to act in the best interest of their clients, but they are not obligated to continue showing properties if the client has already viewed a significant number of options, such as 42 houses.

At this point, Tom has the opportunity to make informed decisions based on the extensive viewing he has already completed. Pursuing legal action to compel a broker to continue showing houses would indicate a misunderstanding of the relationship dynamics and contractual obligations at play. A broker typically cannot be forced to perform further actions beyond what is reasonable, especially after a considerable effort has already been invested.

The other options, such as renegotiating the contract with Mary, filing a complaint, or suing for breach of duties, relate to potential dissatisfaction with the service or actions taken by the broker and are more aligned with common responses in a real estate transaction if issues arise.