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The answer is B because :
A=The oppositely-charged ions are arranged in a regular way to form a giant ionic lattice. It is a 'lattice' because the arrangement is a regular one and 'giant' because the arrangement is repeated many times with large numbers of ions. Ionic compounds often form crystals as a result.
B=Gabbro is a dark, medium- to coarse-grained intrusive igneous rock composed of calcium plagioclase, pyroxene, and minor olivine, but no quartz. It is the intrusive equivalent of a basalt.
C=The crystallization of an organic compound can produce a mixture of crystalline solids with different solid-state structures (polymorphs).[1] No convenient method now exists to separate crystals of a single polymorph from a mixture of crystals of different polymorphs.
D= a fire formed crystal and that is not a rock.
raphealnwobi

Rock can be best described as a mixture of crystals.

Rock is a solid mixture of crystals from one or more minerals, or organic matter fused together to form a solid lump.  Rock has been used since the olden days for buildings, weapons, sculpture, tools and so on. Examples of rock are limestone, marble, and so on.

There are basically three types of rocks based on how they were formed, these are igneous rock, sedimentary rocks and metamorphic rock.

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