Whoever wrote the quiz questions does not understand the precepts taught in this module. They are vague and not very precise in what they ask for. Many times at least 2 of the answers would work equally well. One problem many teachers have is they forget the fact that they are an expert in their field, and their students are only learning it. What is abundantly clear to the instructor might be vague or muzzy to the students. If very few students in a class fail to grasp a concept it is time for the teacher to take a second look at how they are presenting it.