According to the Research on the Use of Diagrams in Problem

According to the research on the use of diagrams in problem solving,

A) diagrams are often helpful because they can convey information in a clear way.
B) a hierarchical tree diagram is a list of steps that must be followed in solving a problem.
C) the most effective way to use diagrams is to construct a matrix representing all possible combinations of options.
D) people seldom solve problems by using diagrams, because verbal representations are much more appealing.