Read the following expression chosen from academic introductions, and identify what part of an intro

Read the following expression chosen from academic introductions, and identify what part of an introduction it refers to：The increasing pollution of ground water resources by nitrites due to the anthropogenic activities from agriculture is receiving worldwide attention.

A.Background of the study

B.Significance of the study of that problem

C.Description of the skeleton of the research

D.Existing studies on the problem

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