Study this excerpt from "how to prepare for a road trip". you wouldn't try running a race without checking your shoelaces and eating a good meal; the same goes for your car on a long trip. * take your car in for a tune-up. be sure the oil has been changed and the tires is in good condition, you have a jack, and you know how to change a tire. * pack an emergency car kit that contains: * jumper cables * a flashlight * a socket wrench for changing a tire * extra oil if your car is old * flares which sentence most accurately explains how the author is using hierarchical structures in this excerpt? a. two kinds of bullet points differentiate racing information from road trip information. b. the author implies a hierarchy of information that is actually unrelated. c. the author fails to distinguish between main points and supporting points. d. two sizes of bullet points distinguish between two levels of information.