Nolan Notes That CTV Might Have Never Emerged as a Network

Nolan notes that CTV might have never emerged as a network were it not for

A) The early successes of Canadian NHL franchises
B) The considerable fan interest in Toronto-based sports teams in the 1960s
C) The success of Hockey Night in Canada to bring hockey into people's homes
D) The secured rights to broadcast games of the 'Big Four' eastern conference of the CFL