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Okay so the last sentence tells us that for any social system, the introduction of labor-saving technology that makes certain economic roles obsolete will tend to undermine the values in that social society. So, we can rewrite that: If there is labor-saving technology that makes certain economic roles obsolete, then this will tend to undermine the values in that social society. We can diagram like so: TERO ==> TUVSS not TUVSS ==> not TERO Thus, the contrapositive explains to us that if the values of a social society do not tend to be undermined, i.e. "a social system whose values are not susceptible to change," then there is no labor-saving technology that makes certain economic roles obsolete, i.e. there is no technology that "can eliminate economic roles." As you can see, the contrapositive above perfectly describes answer choice (C): "A social system whose values are not susceptible to change would not be one in which technology can eliminate economic rules." Hope that helps! Please let us know if you have any other questions.

Thanks a lot for your perfect explanation!!!!^^