«No se trata de una cuestión de dinero, _____ de una cuestión de principios éticos».

Answer and explanation

Correct answer: C. sino

Analysis: After a negative main clause ('no se trata de...'), a direct contrasting nominal phrase is introduced by 'sino'. Answer: sino. Why not the others: 'pero' connects complete clauses; 'aunque' introduces concession; 'porque' introduces cause.

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