The answer is A. Protons.
Answer: copper > chalk > flour > talcum powder > dry beans.
Explanation:
Density is the compactness of given object.
Basically, it is mass per volume.
copper has the most density
chalk has lesser density than copper.
flour has lesser density than copper and chalk.
talcum powder has lesser density than copper, chalk and flour.
dry beans have lesser density than copper, chalk, and flour.
So, it becomes,
copper > chalk > flour > talcum powder > dry beans.
