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The oceanic crust has three
layers; layer 1, layer 2 and layer 3. Layer 1 consists f unconsolidated or
semiconsolidated sediments. It contains of land sediments. Layer 2 is divided
into two parts; uppermost volcanic layer and finely crystalline basalt. It s
thin in the mid ocean but thickens away from the ridge. The third layer
consists of coarse grained gabbros and igneous rocks that have a low content of
silica rocks. It also consists of diabase dikes. So the answer is letter A.

The oceanic crust is composed mainly of diabase, gabbro, and  basalt.

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