Which Statement BEST Exemplifies a Goal-Based Concept

Which statement BEST exemplifies a goal-based concept?

A) Cars, unicycles, boats, and rocket ships are all forms of transportation.
B) Kale, spinach, arugula, and Swiss chard are all leafy green vegetables.
C) Red oak, sugar maple, blue spruce, and black walnut are all trees.
D) Clouds, lightening, rain, and gray skies are seen during a storm.