Final answer:
The correct option is 4). Peter Drucker is the theorist who integrated scientific management with the work of Fayol and developed guidelines for managerial effectiveness, whereas Fredrick Taylor is known for establishing the foundational ideas of scientific management.
Step-by-step explanation:
The theorist who integrated scientific management with the work of Fayol and developed a list of guidelines for improving managerial effectiveness is Peter Drucker.
Fredrick Winslow Taylor, often credited with laying the foundational ideas of scientific management, primarily focused on enhancing industrial efficiency through systematic studies and standardization of work processes, known as Taylorism. Taylor's methods aimed at maximizing productivity by observing, analyzing, and restructuring the tasks of workers, sometimes at the cost of the workers' autonomy and well-being. However, he is not the one known for integrating these practices with Fayol's principles rather, it was Peter Drucker who later expanded on these concepts, integrating them with a broader view of effective management practices.