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Question 104·Medium·Central Ideas and Details

The following text is adapted from Jane Addams’s 1910 memoir Twenty Years at Hull-House.

On my first walk through the dingy streets that bordered the great Douglas Park, I was startled to find how persistently the smoke from the neighboring factories clung to the narrow doorways and begrimed even the pale spring blossoms that ventured through the fences. Ragged children trailed after the wagons laden with refuse, and a continuous clang of machinery beat in upon the houses as if no distance could soften the harsh rhythm. Standing there, I felt an abrupt conviction that mere observation was insufficient; if I lingered in this quarter at all, I must take my part in lessening its obvious burdens.

Which choice best states the main idea of the text?