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. I
• I The professor warned that pursuing research without proper data could lead us up a blind alley. II
• I Trying to argue with someone who refuses to listen is like going up a blind alley.