2. Which of the following is a sample of igneous rock?

Answer: The actual answer is sample B.
Explanation: Igneous Rocks are either known as Intrusive Rocks which are crystallize that form underneath the Earth's Surface, and Extrusive Rocks which are known as volcanic rocks.
Answer:
correct answer IS B
Explanation:
explanation : of the four rocks only rock b is composed of interlocking crystal with no layering