In accordance with the Supreme Court of Canada's ruling in Crocker v$.$ Sundance Northwest Resorts Ltd$.,[1988]1$ S$.$C$.$R$.1186,$ in Canada sliding down a hill in an oversized inner tube can NOT be viewed as constituting which of the following?

Question $12$ options:

a$)$

a waiver of legal rights

b$)$

an assumption of known physical risks

c$)$

a failed defence of volenti non fit injuria

d$)$

a consent to legal risk