Answer:
B
Explanation:
It just is because this is B
<span>
A. Moho barrier </span>The Moho<span> is the boundary between the crust and the mantle in the earth.
</span><span>B. Oceanic crust
</span>is the uppermost layer of the oceanic portion of a tectonic plate. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together constitute oceanic
<span>Lower mantle
</span>A large fraction of Earth's interior, from a depth of about 650 km (400 miles) down to 2,900 km (1,800 miles), consists of the lower mantle, which is composed chiefly of magnesium- and iron-bearing silicates, including the high-pressure equivalents of olivine and pyroxene.
<span>upper mantle
</span>The upper mantle<span> begins just beneath the crust and ends at the lower mantle.
</span>
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