Based on the premise "If his theory were true, Edmund Hillary's ascent of Mount Everest would have been motivated by a desire to test new oxygen tanks, and Joshua Slocum would have circumnavigated the world in order rack up frequent-sailing miles.", can we conclude the hypothesis "His theory is a ridiculous one and should not be taken seriously." is true (see options)?

OPTIONS:
-- yes.
-- it is not possible to tell.
-- no.
yes