Select the word segment that substitutes (replaces) the bracketed word segment correctly and completes the sentence meaningfully. Select the option 'no correction required' if the sentence is correct as given.
In the past, (he spent many an hours rowing down the) River Barrow.
1
he had spent many an hours rowing down the
2
he spent many an hours rowing down
3
he spent many an hour rowing down the
4
No correction required