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Let me walk you through the core logic here.

Let's start by understanding what's happening in this passage:

The argument has a fascinating structure. We have archaeologists who found 3,000-year-old Maya pottery at Colha and concluded "Okay, Maya must have first settled here 3,000 years ago." Makes sense, right? But then - plot twist - someone finds 4,500-year-old stone tools that look like later Maya tools.

Now, here's what you need to see: The passage says these ancient tools "apparently undermine" the 3,000-year conclusion. But why would they? Just because old tools look like Maya tools doesn't automatically mean Maya made them... unless we can rule out other possibilities.

The Key Insight:

Think about it this way - if I find a 4,500-year-old hammer that looks like modern hammers, can I conclude modern humans were there 4,500 years ago? Only if I know that other ancient peoples didn't make similar-looking hammers!

This is exactly what the blank needs to complete. We need something that explains why these 4,500-year-old tools being Maya-like in design points specifically to Maya presence.

Why Answer A Works:

Choice A tells us that other prehistoric cultures in the area made tools with "strikingly different" designs. This is the missing link! If the 4,500-year-old tools:
- Resemble later Maya tools (given in passage)
- AND other cultures made completely different-looking tools (from choice A)

Then these ancient tools were almost certainly made by Maya people, pushing their presence back to 4,500 years ago - way before the pottery evidence suggested!

Notice how Answer B actually weakens the argument by suggesting Maya weren't doing agriculture elsewhere until 3,000 years ago. And choices C, D, and E? They're talking about pottery decorations and social institutions - interesting perhaps, but completely irrelevant to whether 4,500-year-old tools indicate earlier Maya presence.

---

You can check out the step-by-step solution on Neuron by e-GMAT to master the systematic approach for "logically completes" questions - they show you a framework that works across all variations of this question type. You can also explore other GMAT official questions with detailed solutions on Neuron for structured practice here.

The full solution breaks down the passage analysis technique, shows you how to spot trap answers that actually support the wrong conclusion, and teaches you the pattern recognition skills to handle similar archaeological/scientific reasoning questions efficiently.
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