Final answer:
According to this scenario, Alex was exercising the management function of: D) controlling.
Step-by-step explanation:
When Alex, the marketing manager, realized the plan he implemented did not yield the expected sales increase, he promptly decided to adjust the plan to meet the desired outcomes. This action demonstrates Alex's engagement in the management function of controlling. Controlling involves measuring performance, comparing it to objectives, and taking corrective actions if necessary. It is a key aspect of management as it ensures that an organization's activities are aligned with its goals.
A manager like Alex, who recognizes a deviation from expected performance and takes immediate corrective action, exemplifies effective management control. This is crucial in marketing management, where strategies must be adaptable to changes in market trends and consumer behaviors. By employing the controlling function, Alex ensures that his team's efforts are directed towards achieving the company's sales objectives, thus contributing to the overall success of FrontStreet Inc. The answer is option is d.