Answer:
Option B
Present an overview of a longer report for people who may not have time to read the entire document.
Explanation:
An executive summary is a summary which contains the key points of a lengthy report, in a concise manner that can easily be digested by a reader without much effort.
The purpose of having an executive summary in a business report is to make it easy for your intended audience to get the key points of what your report is talking about in a quicker manner, rather than having to read the whole report.