Answer:The correct answer is (c) no bacteria is still in the water. Here's why: - Filtration removes sediments: Filtration is effective at removing visible particles like dirt, sand, and other debris from water. This makes option (a) partially true.- Filtration doesn't guarantee clean water: While filtration can remove some contaminants, it doesn't eliminate all potential hazards. River water can contain harmful bacteria, viruses, and parasites that are too small to be caught by most filters. This makes option (b) incorrect.- Bacteria can remain: Many bacteria are microscopic and can easily pass through standard water filters. This is why option (c) is the most accurate answer.- Softness is unrelated: The softness of water refers to its mineral content, not its cleanliness. Filtration doesn't change the mineral content, so option (d) is irrelevant. Important Note: Even if you use a filter, it's generally not recommended to drink untreated river water without further purification methods like boiling or using a water purifier.