If a manager wants to keep principles useful in a changing market what should he do?

Correct answer: Adjust application according to market situation

The direct answer is A: adjust the application according to the market situation. A management principle is a useful guideline, not a rigid mechanical rule. Markets change because customers, technology, competition and costs change. Therefore, the manager should keep the basic principle but use judgement about how to apply it. Step by step: first observe the new market condition; next identify what part of the old application no longer fits; then modify the method; finally check whether the result improves performance. Option A is correct because it shows flexibility while still respecting the principle. Option B is wrong because using an old method unchanged may ignore new customer needs and competition. Option C is wrong because changing conditions do not make all management principles useless; they require suitable application. Option D is wrong because employee and customer reactions are important human factors that must be considered. Memory cue: principles remain useful when their application is flexible, not when they are followed blindly.