The organizational structure of the U. S. Army's 1st Infantry Division provides for direct two-way lines of responsibility, authority, and communication running from the top to the bottom. Additionally, each person in the division reports to only one superior. The 1st Infantry Division is clearly an example of a (n)

line organization

Explanation:

Line organization -

It is the method of administrative organisation, it is the simplest and the oldest method.

Line organisation, in which the authority flows from the top to the bottom in the concern.

In this, the line of command flows in even basis without any gaps in the communication and coordination.

The example shown in the question, is of line organization.