Final answer:
Coarse-grained (phaneritic) igneous rocks form in intrusive plutonic environments due to slow cooling of magma within the Earth's crust which allows for larger crystals to develop. The correct option is d. Intrusive Plutonic Environments.
Step-by-step explanation:
Igneous rocks with a coarse-grained (phaneritic) texture form in intrusive plutonic environments.
This texture results from magma that cools slowly deep within the Earth's crust, allowing larger crystals to form over thousands to millions of years. These intrusive igneous rocks, such as granite, are often found at great distances from active volcanic areas due to the movement of tectonic plates over geological time periods.
By contrast, extrusive igneous rocks are formed from lava that cools rapidly at or near the Earth's surface, resulting in a fine-grained or aphanitic texture due to the lack of time for crystals to grow. Examples of extrusive igneous rocks include basalt and andesite, which typically appear dull and do not sparkle because they are fine-grained.
Therefore, the correct answer to the question is d. Intrusive Plutonic Environments.