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Question 26·Medium·Text Structure and Purpose

For decades, the city of Saint-Pierre on the Caribbean island of Martinique was known primarily as a bustling port filled with cafés and theaters. Nicknamed the "Paris of the Antilles," it attracted tourists eager to enjoy its cosmopolitan charms and warm climate. That reputation ended abruptly in May 1902, when the nearby Mount Pelée volcano erupted, destroying the city in minutes. Historians today cite the catastrophe as a reminder of the dangers of ignoring early warning signs.

Which choice best states the function of the underlined portion in the text as a whole?