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Fill in the blank with the correct option from the ones given below:-

The scientist proposed _________ theory that challenged everything we knew.

Solution

✅ Correct Option: 4

A theory that challenged everything we knew is revolutionary, i.e. 'groundbreaking'. 'Uppity' means arrogant, 'upright' means honest or vertical, and 'uproarious' means very noisy or funny; none fits a scientific theory.

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