The answer to the question is C
they help see that not one branch has too much power
Answer:
Because practice experiences involve both the learner, the task and the enviroment, and the designer of such experience must tailor it for each of these three aspects.
If the practice experience is not well adapted to the enviroment, the learner, or the task, its effectiveness will be less, and both designer and learner will be unsatisfied at the end of it.