Types of rocks that i know:
Igneous
Metamorphic
Sedimentary
Granite
Basalt
Sandstone
Limestone
Shale
Gabbro
Rhyolite
Schist
Conglomerate
Quartzite
Gneiss
Diorite
Andesite
Obsidian
Dacite
Peridotite
Phyllite
Breccia
Granodiorite
Dolomite
Siltstone
Explanation:
C. no ser sólo conocido....
Hello!

The subject of this sentence is "Yo" (I), so we must use the first-person singular conjugation.
Thus, the correct conjugation ends with an "o", or "Pruebo". Choice A is the correct answer.
A mis padres no les gustan las películas viejas.
Saludos :)