Answer :
Final answer:
Correctly punctuated sentence using commas to set off a non-restrictive clause.
Explanation:
The correctly punctuated sentence is:
Oil, which is lighter than water, rises to the surface.
This sentence correctly uses commas to set off the non-restrictive clause 'which is lighter than water.'
The correct punctuation helps clarify the relationship between oil and water in the sentence.
Learn more about Punctuation in sentences here:
https://brainly.com/question/36920631