Answer the question fast please


The correct option is (B).
Sand filtration is one of the steps involved in the purification of water wherein the sand particles act as an adsorbent for the impurities.
Through sand, the wastewater flows relatively slow, and so, it is used for single-pass filters. Gravel is used for recirculating filters. It can absorb larger amounts of wastewater than sand filters.

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sand and medium gravel my friend
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