Answer:
A legend is a semi-true story, which has been passed on from person-to-person and has important meaning or symbolism for the culture in which it originates and is based on historic facts.A myth however is a story based on tradition , which has a deep symbolic meaning. A myth 'conveys a truth' to those who tell it and hear it, rather than necessarily recording a true event. They are often used to explain how something came about.
The way to tell the difference would be looking for fact and exaggeration. If you see these its most likely a legend. If there is a lot of symbolism or trying to explain the origins of something, it is most likely a myth.
what's the Q? also, how does Mary run away, helping, or supporting junior?
The answer to your question is the third, fifth, and eighth sentence.
In Jack London's "To build a fire" the main theme is Man vs. Nature, the main character is crossing the Alaskan frozen landscape, following the path of the Yukon river. He dismisses the advice of the old-timer and he also doesn't pay attention to his companion, the dog who can feel the threat of the harsh weather. The right answer is the second option.