Why is the cause-and-effect structure so common in expository writing? a. it is an effective way to organize information, and the fact that it is often sequential makes it easy to understand. b. it poses value questions to readers unfamiliar with the subject matter, thereby generating greater reader involvement. c. it packs the greatest amount of information in the shortest possible space. d. it is the form of expository writing that lends itself most easily to the use of an outline.