The detail that suggests workers during the early 1900's found their jobs stressful is "Gregor complains that traveling from place to place is tiresome."
We call detail a piece of information that helps us understand, characterize, or support something in a text. Here, we must look for a detail that supports the idea that workers during the early 1900's found their jobs stressful.
The passage we are analyzing here belongs to "The Metamorphosis." It consists of the main character, Gregor, complaining about his job, especially the traveling part.
According to Gregor, traveling itself is already tiresome. What makes it worse is having to worry about trains and food, as well as not having the chance to get to know people deeply.
With the information above in mind, we can choose option A as the correct answer.
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