This is a strengthen question, which is asking you to support a pretty specific prediction about why scientists need to build
moving machines. Let's break this down together!
Understanding the Core ArgumentThe passage tells you that scientists have built stationary machines that detect spatial relations using light (just like humans do). But then it predicts these scientists won't truly succeed
until they build machines that can move around. That's a pretty strong claim - it's saying movement is absolutely necessary, not just helpful.
What We Need to FindTo strengthen this prediction, you need evidence that explains
why movement is essential for detecting spatial relations the way humans do. Think about it: if the stationary machines already process light information, what crucial element are they missing that only movement can provide?
Let's Evaluate the Key ChoicesWhen you look at choice (A), notice how it says humans are
dependent on visual cues from motion to detect spatial relations. This is exactly what you're looking for! If humans actually need motion-based visual information to detect spatial relations, then those stationary machines are fundamentally missing a crucial component. They can't replicate the human process without being able to move.
Now compare this to choice (B) - it says humans can easily detect spatial relations even when objects are moving. But wait, this doesn't explain why the
machine needs to move. In fact, it might even suggest that movement isn't necessary for the detection process itself.
Choice (C) talks about drawing inferences from light, but stationary machines can already do that. Choices (D) and (E) give you information about spatial detection methods, but none of them explain why mobility would be essential.
The answer is (A) because it directly explains why the prediction would be true - if human spatial detection depends on visual cues from motion, then machines must be able to move to truly replicate this human ability.
You can check out the
step-by-step solution on Neuron by e-GMAT to master the systematic framework for strengthen questions and learn how to identify the logical gap quickly. You can also explore other GMAT official questions with detailed solutions on Neuron for structured practice
here.