[Video] Q4: No change or carbon- or carbon or carbon or

Explanation for Question 4 From the Writing Section on the 2019 March Sat

Question number four is asking us about the appropriate punctuation that should belong in 2 this sentence. So the sentence right now reads further heating, 3 resulted in an extremely thin micro sheets of carbon that could be made 4 into battery anodes. So we need to decide is what form of punctuation, 5 if any, is appropriate here. So looking at our answer choices, 6 this comma here in the no change option, 7 choice a is pretty unnecessary. 8 Um, there's no need to interrupt the flow of carbon that could be made 9 into battery anodes. Um, usually commas are used to either separate 10 a dependent clause from an independent clause or potentially to 11 set aside a particular detail, 12 but here neither of those purposes are relevant. 13 So we don't need the comma, um, 14 answer choice B the dash is a similar reasoning. 15 Um, we don't need a dash here. A dash is often used to add 16 some kind of emphasis to that second detail. 17 Um, but in this case, it makes more sense to keep carbon right next 18 to that relevant detail that could be made into battery nodes without interrupting 19 it. We don't need that additional emphasis, 20 um, answer choice C is the correct answer choice because it doesn't insert 21 any unnecessary punctuation. You should never feel that you have to insert punctuation 22 in one of these questions. Um, punctuation should only be used when it serves 23 a purpose and then answer choice D is also incorrect because it uses a 24 semi-colon with a semi-colon. 25 You have to make sure that both parts of the sentence that you're linking 26 with the semi-colon can stand by themselves or out or otherwise that they're independent 27 clauses. And in this case, we don't have that. 28 The second piece is definitely not a independent class. 29 So for that reason, D is out and the correct answer choice 30 to number four is choice.