_______ is used to separate fine sand from coarse sand in construction sites.

Winnowing

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Handpicking

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Sieving

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Threshing

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Solution

The correct option is C Sieving
Fine sand and coarse sand are not large enough to be separated by handpicking. Therefore, a sieve/mesh containing small pores is used to separate mixtures containing small sized components.
Upon using a sieve, fine sand passes through the pores, while coarse sand stays in the top of sieve. This process of separation where mixtures containing small sized components are separated, is known as sieving.

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