The correct answer is: B. Both (A) and (R) are correct, but (R) is not the correct explanation of (A).
Managerial roles are dynamic in nature because they are constantly changing in response to the changing environment. The skills required to be an effective manager also change over time, as new technologies and methods of management are developed.
However, managerial skills do not define managerial roles. Managerial roles are defined by the tasks that managers are expected to perform, and these tasks can vary depending on the organization and the industry.
For example, a manager in a manufacturing plant may be responsible for planning and scheduling production, while a manager in a retail store may be responsible for managing customer service. These two managers have different roles, but they may both need to be skilled in communication, problem-solving, and decision-making.
In conclusion, both (A) and (R) are correct, but (R) is not the correct explanation of (A).