When the phenotypic expressions of a trait can be separated into a few discrete categories, that trait is said to: a) be a complex trait b) exhibit discontinuous variation c) exhibit continuous variation d) both a and b are true

Option (c) is correct.

Explanation:

When the phenotypic definition of a characteristic can be segregated from one particular category to several discrete categories, then such characteristics are believed to be exhibiting continuous variation. Examples of such characteristics which tend to exhibit continuous variation are heights, age etc.

when your a dog and you need a bone.   go and eat a rabbit

i believe the answer is: description

description refers to the goal of psychologist to identify the phenomenon that being observed. this goal is being actualized by collecting data/information from various clues that observed through the phenomenon. this goal must be accomplished before pyschologist able to create methods of treatment.