Main reason for seed dormancy is?

Correct option is A

Seed dormancy is a natural phenomenon where a viable seed is prevented from germinating even under favorable environmental conditions. The main reason for seed dormancy is often an immature embryo. An immature embryo is not fully developed and lacks the maturity required to initiate the process of germination. The embryo develops within the seed during the maturation process, and until it reaches a certain level of maturity, dormancy is maintained.