The correct answer is A. Mesophytes.
Mesophytes are plants that grow in an environment that is neither very wet nor very dry. They are adapted to a wide range of conditions, and can be found in a variety of habitats, including forests, grasslands, and deserts.
B. Sporophytes are the diploid, spore-producing phase in the life cycle of plants. They are typically larger and more complex than the haploid gametophyte phase.
C. Saprophytes are plants that obtain their nutrients from dead organic matter. They are often found in decaying logs or other areas where there is a lot of dead plant material.
D. Tracheophytes are vascular plants, which means that they have a system of tubes that transport water and nutrients throughout the plant. They are the most common type of plant on Earth, and include trees, shrubs, and grasses.