b) to mountain-bike
since the sentence follows along with to run and to swim the answer has to be "to mountain-bike".
I believe the correct answer would be B., bc it is asking the reader a question, trying to get them to think further into the meaning.<span>
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The correct answer is time/chronological order because chronological order is the sequence of events in a story, and if you put them in at the correct time you get an understandable paragraph, story, etc...
