The answer is A. Managers
Explanation:
Managers are the main individuals in charge of running a business, this includes leading employees, using resources such as money adequately, proposing and developing business projects, controlling activities, among others. Due to this, the action of managers is essential in business, and in most cases determines whether a business is successful or not. Moreover, managers are responsible for all the operations of a business, and they are more involved than investors who provide the money of the business or shareholders who own shares but are not directly responsible for running the business. Thus, the individuals that are responsible for day-to-day operations are managers.