Final answer:
Gantt charts are the tool used by project managers to track project progress, providing a visual representation of the project's tasks, their duration, and their scheduling.
Step-by-step explanation:
The tool that allows project managers to track project progress is called a Gantt chart. Despite the misspelled option as 'Gareth chart' in the question, it is clear that the Gantt chart is the correct answer. The Gantt chart is a visual representation of a project schedule, where tasks are listed on the vertical axis and time intervals on the horizontal. This helps project managers understand what work is scheduled to be done on certain dates.
Each task is represented by a bar; the position and length of the bar reflect the start date, duration, and end date of the task. This allows project managers and team members to quickly see what tasks are in progress, which are completed, and if the project is on schedule. Additionally, dependencies between tasks can be shown, informing the team about which tasks need to be completed before others can start.