Final answer:
a. Plutonic rock is not a type of material ejected from volcanoes during eruptions, as it forms below the Earth's surface. Volcanic ash, lapilli, bombs, and blocks are typical ejecta during volcanic events.
Step-by-step explanation:
The type of material that is not ejected from volcanoes during eruptions is a. plutonic rock. Plutonic rocks, also known as intrusive igneous rocks, are formed deep below the Earth's surface from the slow cooling of magma. They are not expelled during volcanic eruptions.
Instead, materials typically ejected during eruptions include volcanic ash (fragments of rock, minerals, and volcanic glass measuring less than 2 mm in diameter), lapilli (larger fragments of rock, minerals, and volcanic glass measuring more than 2 mm in diameter), bombs (large molten rocks that solidify before hitting the ground), and blocks (solid pieces of volcanic rock expelled from a volcano).