Final answer:
Elisa and her mother moved to Pennsylvania for a new job opportunity and to help family members, supported by the details about the mother's employment and the elderly grandparents needing assistance.
Step-by-step explanation:
The best explanation for why Elisa and her mother moved to Pennsylvania is A) For a new job opportunity and to help family members. This is supported by the details that mention Elisa's mother receiving a job offer and the presence of elderly grandparents requiring family support. Specifically, the two details from the passage that support this answer are:
- B) "Her elderly grandparents lived alone and were now at an age where they needed family nearby."
- C) "Elisa's mother had been out of work for a while and the job she had been offered was a good one."
These statements directly suggest the familial responsibility and employment opportunity as the reasons for their relocation.