«El tren se detuvo bruscamente _____ accionar un pasajero la palanca de emergencia».

Answer and explanation

Correct answer: B. al

Analysis: 'Al + infinitivo' expresses immediate temporal coincidence ('upon pulling the emergency handle'). Answer: al. Why not the others: 'para' expresses purpose; 'en' cannot precede an infinitive directly in this sense; 'por' denotes cause.

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