Question

what notion was challenged by the work of postwar-era scientists?
○ there are no answers.
○ accuracy is impossible.
○ science can explain everything.
○ scientific theories reflect reality.

Explanation:

Post - war era scientific developments (such as in quantum mechanics, complexity science, etc.) showed that there are limits to what science can explain. The idea that "Science can explain everything" was challenged as scientists discovered that some phenomena have inherent uncertainties or are too complex to be fully explained by current scientific frameworks. The other options: "There are no answers" is too extreme and not a common pre - war scientific notion; "Accuracy is impossible" was not a widespread notion challenged by post - war science (in fact, science still pursues accuracy in many domains); "Scientific theories reflect reality" is a more philosophical question about scientific realism, and post - war science's challenge was more about the scope of scientific explanation rather than this realism question.

Answer:

C. Science can explain everything.