Improve the grammar of this text: This accident could perhaps be averted if the conductor had used his personal judgment and halted the train when an unexpected problem was discovered.
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The's first sentence is not correct, but it is the correct one.
The second sentence is incorrect, and the third one is incorrect.
The first sentence is correct, and the second one is incorrect.
The third sentence is correct, and the second one is incorrect.
The first sentence is correct, and the second one is incorrect.
The third sentence is correct, and the second one is incorrect.
The third sentence is correct, and the second one is incorrect.