How does the repetition of the word must affect the tone of the piece

A lot of times, this is called "parallelism". This affects the tones by making the speech all the more emotional, because it reminds the people about that word.

It shows a great deal of emotion as well as urgency in the tone of the work.

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.