What happens next in this paragraph?

A man is surfing, biking, and mountain climbing. he
Possible answers:
(I) is riding a surf board, then riding the surf board.
(II) goes around a large waterfall and ahead of him there are some other surfers.
(III) does all of the acrobatics on the mountain using a surf board.
(IV) ; is then seen climbing the side of a mountain with skis.
(IV)