In the life cycle of seedless vascular plants, which of the following statements accurately describes the role of gametophytes?

• A. Gametophytes are the dominant stage in the life cycle
• B. Gametophytes are diploid and produce spores
• C. Gametophytes are responsible for photosynthesis in vascular plants
• D. Gametophytes are haploid and produce gametes

Answer: (D)