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According to the image, which of the following steps of wastewater treatment uses biological reduction techniques?

I. Scum Removal
II. Dryer
III. Aeration
IV. Sludge Digestion

G., Leonard. "File:ESQUEMPEQUE-EN.jpg." File:ESQUEMPEQUE-EN.jpg. Wikimedia Foundation, 4 May 2015. Web. 15 Feb. 2016. <https://commons.wikimedia.org/wiki/File:ESQUEMPEQUE-EN.jpg.

A

I and II only

B

II, III and IV only

C

III and IV only

D

III only

E

I, II, III and IV

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