Final answer:
The Hamiltons decided to stay in the boarding house mostly because they were not able to afford other accommodations.
Step-by-step explanation:
The subject of this question is Social Studies. The question is asking about the reasons why the Hamiltons decided to stay in a boarding house. From the options provided, the most appropriate answer is: 'They were not able to afford other accommodations.' This is indicated by the statement 'All of the railroad men rented from Mrs. Jones,' suggesting that the boarding house was a more affordable option for them.