Final answer:
Seeds offer protection of the embryo, a dormant phase for delayed germination, and mechanisms for enhanced dispersal, making them highly adaptive for survival and propagation on land. Thus, the option d is the correct answer.
Step-by-step explanation:
Seeds offer protection of the embryo, a dormant phase, and enhanced dispersal ability. These functionalities are important evolutionary adaptations that allow seeds to protect the vulnerable embryo from environmental hazards and desiccation, maintain dormancy under unfavorable conditions to ensure germination when the conditions are optimal, and spread the species across different geographical areas. This comprehensive package that seeds offer, including the protection and nourishment of the embryo, as well as mechanisms for dormancy and dispersal, demonstrates why seeds have become a key factor in the success and proliferation of seed plants on land.