The igneous rock with a features of medium-gray and fine-grained groundmass with large crystals of plagioclas is one that crystallized at depth from intermediate-composition magma which rose to the surface and became a lava flow.
An igneous rock is called an rock that solidifies from a form of hot molten into a rock crystallizes.
Hence, the features describes is one that crystallized at depth from intermediate-composition magma which rose to the surface and became a lava flow.
Therefore, the Option C is correct.
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