The most commonly used chemicals in the artificial rainmaking or cloud seeding are

Artificial rainmaking, also known as cloud seeding, is a way to increase rainfall.
It involves sprinkling certain chemicals into clouds to encourage them to release their water.
Silver iodide (AgI) is a very common chemical used for this purpose. It works because its crystal structure is similar to ice, attracting water molecules and helping form larger raindrops.
Sodium chloride (NaCl), or common table salt, can also be used, though less frequently than silver iodide. It also helps in the formation of rain droplets.
Dry ice (frozen carbon dioxide, CO2) is another substance used in cloud seeding. It cools the air around it, creating ice crystals that help to make rain.
Therefore, all three options - silver iodide, sodium chloride, and dry ice - are used in artificial rainmaking.
The correct answer is D: All of the above.