Chronological pattern of organization
A chronological pattern organizes information as a progression of time. The time can move forward or backward as long as a logical progression takes place. Best suited for topics that are broken into segments of time, a chronological pattern consists of main sections covering a particular period of time and subsections under each main section covering segments or events within the time period of the main section. When you’re writing about a historical topic, this pattern works well.
maybe the author just want to keep that info secret and the story maybe not true at all so author doesn't want to tell readers, that what I think!
4 with a 1 with b c with 2 d with 3