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The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________

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The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________

(a) Flocculation

(b) Bacterial activity

(c) Precipitation

(d) Sedimentation

I had been asked this question during an interview.

My doubt stems from Biological Treatment of Waste Water topic in section Biological Treatment of Waste Water of Environmental Biotechnology

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The correct choice is (b) Bacterial activity

To elaborate: The hollow rhizomes of the reeds that grow from the growth nodes, generate a hydraulic pathway thereby treating sewage using the colonized rhizosphere bacteria and rhizomes in the root tips, hence, it uses bacterial activity and Precipitation and Sedimentation is the general method by which the particles sediments at the bottom or precipitation by which particles precipitates, Flocculation is a process in which colloids get suspended in the form of flocs.

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