What commonly horizontal intrusive igneous body is formed when magma is injected parallel to sedimentary rock layers?

When this takes place the intrusive igneous rock is called a sill.  A good example is the Palisades Sill in New York State near the Hudson's River which is a prominent cliff-former and is intruded into the surrounding sedimentary rock parallel to the layers. It's composition is approximately that of a basalt. Its' age is Triassic, or about 200 million years old. 

Ithink the answer is b

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