NEET Biology question

Read the given paragraph where a few words have been italicised and select the correct option regarding them: "When wastewater is treated in a wastewater treatment plant, first it is passed through *bar screens* where large objects like sticks, cans and rags are removed. Then water goes to a *grit and sand removal tank* where speed of the wastewater is *decreased* to allow sand, grit and pebbles to settle down. The water is then allowed to settle in a large tank where *sludge* settles down and is removed continuously by a *skimmer*. The clarified water is then pumped into an *aeration tank* where *anaerobic* bacteria grow rapidly and consume organic matter."

• (A)*Bar screens* and *grit and sand removal tank* should be interchanged.
• (B)*Decreased* should be changed to *increased*.
• (C)*Sludge* should not be replaced as it is correctly mentioned.
• (D)*Skimmer* should be replaced by *scraper* and *anaerobic* should be replaced by *aerobic*.Correct