Obsidian Is an Igneous Rock with a Glassy Appearance and Minimal

Multiple Choice

Obsidian is an igneous rock with a glassy appearance and minimal crystal growth.What accounts for this?

A) Obsidian is an intrusive igneous rock that cooled slowly beneath Earth's surface,result in little crystal growth.
B) Obsidian is an extrusive igneous rock that cooled slowly on Earth surface,resulting in little crystal growth.
C) Obsidian is an extrusive igneous rock that cooled very slowly on Earth surface,resulting in little crystal growth.
D) Obsidian is an intrusive igneous rock that cooled rapidly beneath Earth's surface,result in little crystal growth.