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.

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

Explanation:

The procedure in which a capable consumer business is bifurcated into categories, which is based on various features. The types or categories produced is comprised of customers who will respond to the campaigns of  marketing in a similar pattern and who share attributes like matching interests, desires or places, thus understood as market segmentation. College students are not covered under sufficient reachable market segmentation in some cases, as they are students and more focused towards education, thus job pursuing or business owning candidates are much preferred to be eligible for the market product policies.

b is the correct answer