Error spotting (advanced): Identify the erroneous part — choose D if there is no error — 'In management, as you rise higher, / the problems you face becomemore and more unstructured and you can't just fall back on / the tools you had been / No error.'

Given sentence parts (A–D)A. In management, as you rise higher,B. the problems you face becomemore and more unstructured and you can't just fall back onC. the tools you had beenD. No error.

Concept/Approach (typo, spacing, and completeness)Part B contains a typographical error (becomemore → become more) and leaves a preposition (fall back on) without its object unless Part C supplies it. The corrected flow requires both the space and a clear object in Part C (e.g., 'the tools you had been using').

Step-by-step correction1) Insert space: 'becomemore' → 'become more'.2) Ensure completion: 'fall back on' should be followed by a noun phrase; Part C should read 'the tools you had been using.'3) Corrected: '…the problems you face become more and more unstructured, and you can't just fall back on the tools you had been using.'

Common pitfallsOverlooking typographical merges and leaving prepositional verbs without objects.

Final AnswerB — fix 'becomemore' and complete the 'fall back on …' construction.