Answer :
Answer:
The sentence that is puctuated correctly is B. When the milk carton fell, it spilled; but I picked it up before all the milk flowed onto the floor.
Explanation:
Sentence B is punctuated correctly because the following puctuation rules are respected:
- there are two related independent clauses joint by a semicolon -when the milk carton fell, it spilled and but I picked it up before all the mil flowed onto the floor.
- the adverbial clause -when the milk carton fell- is separated from the rest of the sentence with a comma.