Question

marty
\okay,\ says paul. \what are they?\
\first, you need a good pair of boots.\ marty takes out his boots and shows them to paul. \boots keep your feet dry, they keep you from falling, and they make it so your feet dont hurt after days of walking.\
marty puts his boots in the bag.
\second, you need a map.\ marty takes out his map. \it is important to have a map. if you dont have a map, then you wont know what is in front of you. you could hike into a river, you could hike up a mountain, or you could even hike off a cliff.\
marty puts his map aside and takes out his compass.
\third, you need a compass, as a compass tells you which direction you are going. it tells you whether you are walking north, south, east or west. now, look at the map!\
paul looks at the map.
\imagine you need to get water. the river is west, so if you need to
in the middle of the passage, marty says, \you could hike into a river, you could hike up a mountain, or you could even hike off a cliff!\ why does he say this?
highlight text
a to see what is behind you
b to explain why you need to use a map
c to show why having a good pair of boots is so important
d to highlight how swimming is better than hiking

Explanation:

To solve this, we analyze the context. Marty says the map is important because without it, you don't know what's in front of you, and then he gives the examples of hiking into a river, up a mountain, or off a cliff. These examples are to illustrate the consequence of not having a map, which explains why a map is needed. Option A is incorrect as the examples are about what's in front, not behind. Option C is wrong because the examples are about the map, not boots. Option D is irrelevant as there's no comparison between swimming and hiking. So the correct answer is B.

Answer:

B. to explain why you need to use a map