Question
In the following questions, an idiom has been used in
three different ways. Choose the option corresponding to the sentences in which the usage of the idiom is CORRECT or APPROPRIATE. UP A BLIND ALLEY I) After following several unreliable leads, the detective realized he was up a blind alley in solving the case. II) The professor warned that pursuing research without proper data could lead us up a blind alley. III) Trying to argue with someone who refuses to listen is like going up a blind alley.Solution
1st sentence is correct, as it shows the detective reaching a dead end, fitting the idiom perfectly. Similarly 2nd & 3rd sentences are also correct as it warns of unproductive research and a futile argument, respectively, appropriately using the idiom.

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