A hierarchy of levels of learning is helpful in writing objectives because: a. they are written for cognitive, affective, and psychomotor areas
b. focus on a knowledge base
c. they suggest observable, measurable behaviors that may occur as the result of both simple and complex learning
d. all of the above

D

Explanation:

Hierarchy of learning objectives was given by Bloom. These include remembering, understanding, applying, analyzing, evaluating, creating.

The hierarchy is important as -

So, for 'all of the above'

yes

it is because 3 because the citizen the northern democratic party watned the warning on red to blue because it is purple. lol