Which of the following is a common workflow management tool?

Trello is a common workflow management tool because it is designed specifically to facilitate the organization and tracking of projects and tasks. It uses a card and board system where users can create tasks, assign them to team members, set deadlines, and move tasks through various stages of completion. This visual and collaborative approach allows teams to easily manage workflows, prioritize tasks, and enhance communication among members, making it effective for workflow management.

In contrast, the other choices serve different primary purposes. For instance, Microsoft Word is primarily a word processing application designed for creating and editing text documents. Excel focuses on data organization and analysis through spreadsheets, which is not specifically oriented towards workflow management. PowerPoint is used for creating presentations, making it more suited for visual communication rather than managing workflows.