Q.A manager who applies principles of management to get the maximum output from the minimum input of men, money, material and machinery is achieving which benefit of these principles? (A) Scientific decision-making
(B) Optimum utilisation of resources
(C) Meeting the requirements of a changing environment
(D) Management training and research

Getting the maximum possible output from the minimum possible input of resources is, by definition, using those resources in the most efficient combination.

This is one of the clearest, most direct benefits of applying tested management principles.

The scenario describes a manager who achieves maximum output from minimum input of the organisation's resources — men, money, material and machinery — which is the very definition of the optimum utilisation of resources benefit of principles of management.

Option-by-option analysis:

(A) Scientific decision-making is incorrect here — that benefit is about the quality and soundness of the decision-making process itself (basing decisions on facts and analysis), not specifically about maximising output relative to input.

(B) Optimum utilisation of resources is correct. Principles of management guide a manager toward combining and deploying resources in the most efficient way possible, avoiding waste and duplication, so that the organisation gets the greatest possible output for a given level of input — exactly what the question describes.

(C) Meeting the requirements of a changing environment is incorrect — that benefit is about adapting the organisation's practices to external change (new technology, new competition, and so on), not about resource efficiency as such.

(D) Management training and research is incorrect — that benefit is about principles giving management the character of a teachable discipline, supporting education and further study, which is unrelated to the resource-efficiency scenario described.

Students sometimes select "scientific decision-making" whenever a question mentions a manager "applying" a principle at all — but the specific outcome described (maximum output, minimum input) always points to optimum utilisation of resources, regardless of which principle was applied to get there.