Final answer:
The feature that does not support the inclusion of Charophytes in the Plantae kingdom is the lack of chlorophyll. Charophytes do possess chlorophyll, which is a key characteristic aligning them with other members of the Plantae kingdom.
Step-by-step explanation:
The feature that does not support the inclusion of Charophytes in the Plantae kingdom is c) Lack of chlorophyll. Charophytes, like land plants, contain chloroplasts with chlorophyll a and b which is essential for photosynthesis. Cell walls containing cellulose and multicellular gametangia are present in Charophytes, aligning them more with plants than other algae. Though they lack some features of fully evolved land plants, such as true vascular tissue, they still possess many characteristics that justify their inclusion in the Plantae kingdom.
All plants share the following three characteristics: they are multicellular, have cell walls with cellulose, and carry out photosynthesis using chlorophyll. The plant cell wall provides structure and protection. The organelle responsible for photosynthesis is the chloroplast. Differences in the lifecycle stages of plants are significant, for instance, the main difference between a sporophyte and a gametophyte is that a sporophyte is the diploid stage that produces spores while a gametophyte is the haploid stage that produces gametes.