Final answer:
Aneurin Bevan passed away in the year 1960, which is the correct answer to the student's question about the event that isolated Hugh Gaitskell.
Step-by-step explanation:
The student is inquiring about the year Aneurin Bevan died, which led to the isolation of Hugh Gaitskell in the context of British political history. The correct answer to the question is C) 1960.
Aneurin Bevan, a prominent figure in the Labour Party and the architect of the National Health Service, passed away on July 6, 1960. This event left Hugh Gaitskell, the Leader of the Labour Party from 1955 to 1963, politically isolated within the party.