According to the ArchiMate 3.2 Specification1, a driver represents an external or internal condition that motivates an organization to define its goals and implement the changes necessary to achieve them. Drivers that are associated with a stakeholder are often called "concerns" of that stakeholder. A stakeholder represents the role of an individual, team, or organization (or classes thereof) that represents their interests in the outcome of the architecture. A motivation element is an element that represents the reasons for designing and implementing an architecture, such as stakeholders, drivers, goals, principles, requirements, or value. A motivation element is denoted by a hexagonal shape.
The diagram below shows a motivation element (driver) named Market Share that influences a stakeholder named CMO. The influence relationship is denoted by a dashed line with an open arrowhead.
The influence relationship means that the driver affects the stakeholder's interests or concerns. Therefore, the best interpretation of the diagram is that the CMO is motivated by the driver Market Share.