Which of the following could only be known by reasoning (not by direct observation)?

Question

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The number of legs on a grasshopper (A) and the time on your clock (D) can be directly observed. The weight of two fish (B) and whether there are any clean dishes in your house (E) can also be directly observed, although it may require some searching. However, intelligence is an abstract concept and cannot be directly observed. Therefore, determining which of two people is smarter (C) can only be done through reasoning, such as through IQ tests or academic performance evaluations.

Which of the Following Could Only Be Known by Reasoning