Annie is reading an essay about how using bicycles for transportation can reduce the level of pollution. which text structure can this question to identify?

how do bicycles influence the level of pollution?

a.
cause and effect
b.
compare and contrast
c.
chronological order
d.
description

a. cause and effect

(bisicles don't use gas and doesn't smoke)

i think the correct answer would be adjustments in life roles.  this causes for one to adjust or change totally his/her career or lifestyle since the present is not beneficial to the life role he is at. for instance, you became a mother you would of course stop going to malls and enjoying life outside. you would be staying at home taking care of your child.