Since the 1960s, What Has Been the Biggest Indicator of the Decline

Since the 1960s, what has been the biggest indicator of the decline in British civic culture?

A) Increasing use of violence by labor union activists
B) Declining self-identification with Britain, especially by Welsh and Scots
C) Increasing ideological polarity between the Labour Party and the Conservatives
D) Increasing calls for reducing the budget of the British monarchy
E) Declining viewership of British national soccer games