Which of the following options is correctly punctuated?
A. The runaway truck, which had been parked on a steep hill swerved and teetered, before jumping a curb and slamming into a tree.
B. The runaway truck, which had been parked on a steep hill, swerved and teetered before jumping a curb and slamming into a tree.
C. The runaway truck which had been parked on a steep hill swerved, and teetered before jumping a curb and slamming into a tree.
D. The runaway truck which had been parked on a steep hill swerved and teetered before jumping a curb, and slamming into a tree.
Having commas that separate the additional information “which had been parked on a steep hill” is the most correct use of the punctuation because it shows that the sentence can do without that piece of information. The additional information is only used to add more details but can still be excluded and that is why it is enclosed in commas.
Therefore, the Correct Answer is B.
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