The correct answer is: C. angiosperms.
Angiosperms are the most diverse group of plants, and they are the only plants that produce flowers. Flowers are important for reproduction, as they attract pollinators that help to transfer pollen from one flower to another. Angiosperms also have fruits, which are the structures that develop from the ovary of the flower. Fruits protect the seeds and help to disperse them.
Gymnosperms are another group of plants that produce seeds, but they do not produce flowers. Gymnosperms reproduce by cones, which are structures that contain the male and female reproductive organs. Gymnosperms include plants such as pines, firs, and spruces.
Bryophytes are a group of plants that do not have vascular tissue. This means that they do not have xylem and phloem, which are the tissues that transport water and nutrients in plants. Bryophytes include mosses, liverworts, and hornworts.
Algae are a group of photosynthetic organisms that are not plants. Algae include single-celled organisms, such as diatoms and dinoflagellates, as well as multicellular organisms, such as seaweeds.