When do we need slope in our everyday lives?

In building roads people have to figure out how steep the road will be. Skiers or snowboarders think about the slopes of hills in order to judge the dangers, speeds, etc.

Some real life examples of slope include: in building roads one must figure out how steep the road will be. skiers/snowboarders need to consider the slopes of hills in order to judge the dangers, speeds, etc. when constructing wheelchair ramps, slope is a major consideration.

answer: i believe its b. if you sound out the sentences that sounds wrong.