The three essential pieces of information in the abstract section of an informal document are A. buffer, appeal, and background. B. purpose, scope, and summary. C. conclusion, recommendations, and next step. D. ethos, pathos, and logos. Solution Ans ( B ) Purpose : for the report - why are you writing it ? Scope : what range of information does the report contain ? Summary : what main information does the reader most want or need to know..