Please your help with the following question:

In the industrialized nations, the last century has witnessed a shortening of the average workday from twelve hours or longer to less than eight hours. Mindful of this enormous increase in leisure time over the past century, many people assume that the same trend has obtained throughout history, and that, therefore, prehistoric humans must have labored incessantly for their very survival.
We cannot, of course, directly test this assumption. However, a study of primitive peoples of today suggests a different conclusion. The Mbuti of central Africa, for instance, spend only a few hours each day in hunting, gathering, and tending to other economic necessities. The rest of their time is spent as they choose. The implication is that the short workday is not peculiar to industrialized societies. Rather, both the extended workday of 1880 and the shorter workday of today are products of different stages of the continuing process of industrialization.

9. Which of the following inferences about industrialization is best supported by the passage above?
(A) People in advanced industrialized societies have more leisure time than those in nonindustrialized societies.
(B) An average workday of twelve hours or more is peculiar to economies in the early stages of industrialization.
(C) Industrialization involves a trade-off between tedious, monotonous jobs and the benefits of increased leisure.
(D) It is likely that the extended workday of an industrializing country will eventually be shortened.
(E) As industrialization progresses, people tend to look for self-fulfillment in leisure rather than work.

OA is

why is B wrong? I think that is similar to B.
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I agree with above its D and not B
because it does not state when the drop off occurs, the prompt only states that at some stage work changes from heavy to light so it is improper to assume that the prompt means early stage.

source ?
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The catch is the time reference - how early or when?
(B) An average workday of twelve hours or more is peculiar to economies in the early stages of industrialization. ----> this cannot be inferred without getting questioned.
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