Which of the phrases given below the sentence should replace the word/phrase given below in bold in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, mark 'No correction required as the answer.
On the eastern horizon, a huge cloud of smoke from burning oil tanks stretched below the sky.
1
oil tanks stretched on the sky
2
oil tanks stretched in the sky
3
oil tanks stretched for the sky
4
oil tanks stretched across the sky
5
No correction required