[Video] Q29: No change or replaced—by another army, or replaced by another army or replaced by another army:

Explanation for Question 29 From the Writing Section on the Official Sat Practice Test 4

So now I'm looking at question number 29. 2 This is another punctuation question. So we're going to go about it by the 3 process of elimination. And we'll start by looking at question, 4 um, or rather answer choice. A so 29 is right here and 5 the sentence tells us that today's researchers have found that the veritable army 6 of trained volunteers traveling the country conducting face-to-face interviews. 7 Cause sometimes you're replaced by another army, 8 the vast rate of individuals, volunteering details about their lives through social 9 media. Um, and so what we need to see here 10 is that really there are two sentences being con uh, 11 condensed into one. This is a run-on sentence, 12 right? So here's our first complete sentence, 13 another army, right? And then it says the vast array of individuals volunteer, 14 volunteering details about their lives through social media, 15 or rather actually this is not a complete sentence, 16 but it is a run-on sentence, what we have here. 17 So this is a run-on sentence. And what we have here is a dependent 18 clause. You know, we only have the subject, the vast array. 19 We don't have a verb. And so, because we don't have a verb, 20 right? We can't think about something having punctuation here as a complete sentence. 21 But if we're looking at this part right here in the middle, 22 right, we see, we need some type of punctuation there to fix the run-on 23 sentence. So wrong question there. 24 So a isn't going to work and, um, 25 al...