Which of the following claims is supported by this source? We sailed from Nagasaki and clean, beautiful Japan, the night of 20 June, pass-through the yellow sea, and reached Shanghai, China, on the 23rd. We left our steamship, the Doric, so 3 miles out in the bay, and with regrets we waved her last goodbyes as we sailed out from under her protection. She had been a home to us and seemed like a part of our own dear country. Many times we had gone out into the unknown cities and back again to her as a refuge. We remain in Shanghai eight days, but were only in the foreign concession. This concession is a modification of both the far east in the west. I never saw man work before! They do work of beast and are treated like beast. China is sickly populated and the people cry out against any device that takes labor and support from their poor Coolie classes. A. When this was Written, many Europeans were familiar with Chinese culture B. When this was written, china was a more developed country than Japan C. When this was written, foreigners were not allowed in any part of China D. When this was written, Shanghai’s economy relied largely on manual labor and support from their poor coolie classes in what way might a historian use a source like the one above

The above text is referring to the Shanghai working class, which was basically made up of poor people. This is very evident when the narrator states that he stayed eight days in Shanghai and saw how people worked constantly and with poor working conditions, "they worked like animals, as the narrator says. In summary, the narrator shows that when that was written in writing, Shanghai's economy was largely dependent on manual labor and support from the poor coolie classes.

A historian can use this source to describe how economic processes and the working classes have evolved in China over time.