In Salesforce Lightning Dashboards, Text Widgets allow administrators to add descriptive text, titles, and custom narratives directly alongside data visualizations. This is a key feature for "telling a compelling data story" because it allows the admin to provide context, explain the significance of certain charts, or provide instructions and motivational messages to the team. By adding text widgets, a dashboard moves from being a collection of raw charts to a guided analytical experience. The Highlights Panel (Option C) is a feature of Record Pages, not Dashboards.
Assigning tasks (Option B) or sending mass emails (Option D) are communication methods but do not enhance the visual or narrative quality of the dashboard itself. Text widgets empower administrators to highlight trends and call out specific goals, making the data more actionable and easier to interpret for the sales reps.