College students can be a less market segment because students' media habits are quite diverse and firms might have to use a wide variety of media to attract this segment.

reachable

Explanation:

Market segments constitutes market divisions or product of market segmentation whereby the market for goods and services is divided into various segments each holding together consumers that share certain characteristics rekevant for the product consumption. Characteristics such as lifestyle, needs, demography, common interest are all considered.

College students segmentation however involve young people with varied traits and habits and could be less predictable and challenging to get to.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.