I would say the one least likely to cause outdoor environment contamination is going to be D, fertilizers.
Fertilizers are meant to help the environment, not damage it.
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theme gives readers better understanding of main characters conflict , experiences discoveries
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An Algorithm is a clearly defined set of instructions to solve a problem, Heuristics involve utilising an approach of learning and discovery to reach a solution. So, if you know how to solve a problem then use an algorithm. If you need to develop a solution then it's heuristics.
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