When Did Distinct LGB Communities Become Visible in Canada in the 1970s

When did distinct LGB communities become visible in Canada in the 1970s in Toronto,Vancouver and Montreal?

A) When heterosexual businesses began increasingly refusing to serve gay clientele.
B) LGB individuals began to refuse to use services operated by heterosexual people.
C) There was sudden and dramatic increase in the acceptance of homosexuals by heterosexuals at that time.
D) There was a flourishing of businesses catering to a gay clientele.