The correct answer is D. No error.
The sentence is grammatically correct. The past participle “been” is used correctly as an adjective to modify the noun “tools.” The sentence means that as you rise higher in management, the problems you face become more complex and you cannot rely on the same methods and solutions that you used when you were at a lower level.
The other options are incorrect because they contain grammatical errors. Option A is missing a comma after the word “higher.” Option B is missing a verb after the word
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