Explanation:

Let’s break down these options and see what’s actually true about the thickness of Earth’s crust:

- Option 1: 10 km to 200 km

? This is off. Earth’s crust isn’t thick enough to hit 200 km anywhere.

- Option 2: 50 km to 300 km

? This range is much too thick. No crust is 300 km.

- Option 3: 30 km to 400 km

? Again, way overstated. The crust tops out way before 400 km.

- Option 4: 100 km to 200 km

? Still much thicker than reality.

Here’s what’s real: The continental crust usually ranges from about 30 km to 70 km thick. Under oceans, the crust can be as thin as 5–10 km. So the accurate range sits around 5 km to 70 km, not any of these options.

What this really means is: None of these choices are perfectly correct—but Option 1 (10–200 km) is the closest, since oceanic crust can be as thin as 10 km, but the top end (200 km) is not accurate. The crust doesn’t ever get that thick; that’s heading into mantle territory.