The longest path to the completion of the project is called the _____.

A) critical path
B) project logic diagram
C) milestone schedule
D) work breakdown structure
E) scope of work

The longest path to completion is known as the critical path. It is a vital concept in project management as it defines the shortest possible time required to complete a project. It identifies the tasks that cannot be delayed without affecting the project's completion date. Therefore, Option A is the correct answer. Option B - project logic diagram, Option C - milestone schedule, Option D - work breakdown structure, and Option E - scope of work are unrelated to the longest path to completion.