Option 1: Cool and wet conditions may not be the best for seed preservation as moisture can lead to seed decay and fungal growth. Excess humidity can also cause seeds to sprout prematurely.

Option 2: Hot and dry conditions are also not ideal for seed preservation as high temperatures can damage the viability of seeds and cause them to lose their ability to germinate.

Option 3: Cool and dry conditions are the best for seed preservation. Low temperatures slow down seed aging processes, while dry conditions prevent the growth of mold and other microorganisms that can harm the seeds.

Option 4: Hot and wet conditions are not suitable for seed preservation as high temperatures and moisture can lead to seed damage and reduce their shelf life.

The correct answer is option 3.