What type of plant primarily has special groups of cells that form vessels for the transport of liquids?

The correct answer is C, as vascular plants are characterized by having specialized tissues for the transport of water, nutrients, and sugars throughout the plant. These specialized tissues include xylem and phloem, which form vessels that facilitate the movement of liquids. Xylem is responsible for transporting water and dissolved minerals from the roots to the rest of the plant, while phloem carries the products of photosynthesis from the leaves to other parts of the plant.

Flowering plants, which are a subset of vascular plants, do utilize these vessels but do not encompass all plants with these characteristics broadly. Cacti, while being vascular plants, do not solely define this characteristic across the plant kingdom, as they have adaptations for water conservation rather than vessel formation in a general sense. Non-vascular plants, such as mosses and liverworts, lack these specialized vessel tissues entirely, relying on diffusion for water and nutrient movement, which illustrates the unique advantages of vascular systems in plant evolution and biology.