The first line of the introduction in a formal report , you should mention what the _______________ of the report is.a.recommendb.informationc.subheadingd.aim

In a formal report, the first line of the introduction typically highlights the primary purpose or objective of the document. Therefore, the correct option to fill in the blank is "d. aim."

The aim of the report provides clarity to the reader about what the report intends to accomplish or analyze. It sets the stage for the content that follows, giving the reader a clear understanding of the main focus and objectives of the report. By stating the aim in the introduction, the writer establishes context and direction for the information presented later in the document, making it easier for the audience to follow the arguments or findings detailed in the report.