Match the following and choose the correct option given below.
| A. Steel industry | i. Alkalis, ammonium compounds, fatty acids and sulphonated hydrocarbons |
| B. Detergent industry | ii. Putrefied organic matter |
| C. Paper industry | iii. Iron cyanide, cadmium, phenol, mercury, thiocyanide, etc. |
| D. Food industry | iv. Bleaching substances, cellulose fibers, organic acids, etc. |
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