The Time Traveller thinks that the upper and lower classes evolved into two species because of lack-of-work and working in underground factories, respectively.
In the science fiction novel "The Time Machine", the main character is the Time Traveller. As he travels to the future, he finds out that the humans have evolved into two different species, and he comes up with an explanation as to why after observing them.
According to the Time Traveller, the lower class evolved from working in underground factories. The upper class, on the other hand, evolved due to lack of work. So much so that they are feeble, weak.
With the information above in mind, we can conclude that option C is the correct answer for this question.
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