Understanding the argument -
History provides many examples of technological innovations being strongly resisted by people whose working conditions without those innovations were miserable. - Background info. There are many examples of people with poor conditions resisting tech innovations.
This shows that social inertia is a more powerful determinant of human behavior than is the desire for comfort or safety. - Conclusion. Social inertia (poor conditions) is a more powerful determinant than comfort. Two random events happened and the author tries to correlate those. How do we weaken this? By providing an alternative reason for their behavior.
Which one of the following, if true, most seriously undermines the reasoning in the argument?
(A) People correctly believe that technological innovations often cause job loss. - ok. Job losses are a powerful alternative reason.
(B) People are often reluctant to take on new challenges. - out of scope.
(C) Some examples of technological innovation have been embraced by workers. - some can be at least 1 which weakens by providing an exception. It's a weak, weakener. But what does the question stem ask about? "most seriously undermines the reasoning," so option A is the stronger one.
(D) People tend to adapt easily to gradually implemented technological innovations. - how the innovations are implemented is out of scope.
(E) People correctly believe that technological innovations almost always increase workers’ productivity. - out of scope.