Fanning mill is

✅Explanation: A fanning mill is an agricultural machine used to clean grains and seeds. It utilizes a combination of air flow and screens to separate the desired material from chaff, dust, weed seeds, and other debris based on size and weight differences. This cleaning process is essential to ensure the quality of the seeds before storage or planting.

📌Other Options Explanations:
-Option B: Hammer mill: A hammer mill crushes and grinds materials using rotating hammers.
-Option C: Blower: A blower is a device that produces air flow but lacks the screens necessary for the separation process in a fanning mill.
-Option D: Rice mill: While a rice mill processes rice, it performs more complex operations than just cleaning, like removing the husk and bran layers.