Slow cooling produces igneous rocks with large crystals and a texture.
a) porphyritic
b) coarse-grained
c) fine-grained
d) glassy

Igneous rocks are  generated through the cooling and solidification of  lava.
therefore,
Slow cooling of igneous rocks with large crystals and a  coarse-grained.
hence,
the right answer is option B) coarse-grained

Themes; subfields is the answer

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