«Los arqueólogos excavaron con extremo cuidado _____ no dañar los restos óseos prehistóricos».

Answer and explanation

Correct answer: A. para

Analysis: 'Para + no + infinitivo' expresses negative purpose ('in order not to damage'). Answer: para. Why not the others: 'por', 'debido a', and 'a causa de' express cause, which is inappropriate for deliberate prevention.

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