La expresión que mejor representa una síntesis del fragmento del discurso es: c) Procurar el bienestar de los trabajadores de la mina de Chuquicamata.
Option "c) Ensure the well-being of the Chuquicamata mine workers" is the one that best represents a synthesis of the speech fragment because it captures the central idea of the statement without going into specific details.
The term "providing well-being" is one that consist of the general intention of promoting a positive and beneficial environment for workers. The other options tend to be more specific or add elements that are not clearly present in the original fragment.
So, The synthesis seeks to summarize the main idea in a clear and concise manner.