Answer:

C. Sieving

Explanation:

A sieve is close woven screen. This is an instrument made up of a hoop and fabric, normally light colored horsehair, with the lower part being closed. It serves to separate the fine grains of gypsum plaster, cement, sand, etc. This is helpful especially in road building.

c. sieving

A mixture made of solid particles of different sizes, for example sand and gravel, can be separated by sieving.

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