Context: This is a piece of basalt. It formed through the cooling of melted rock at the earth's surface, called lava.
As the lava cooled, mineral grains began to form. Basalt is made of minerals such as olivine and feldspar. The mineral grains in basalt are small. This is because the lava cooled quickly.
What type of rock is basalt?
A. sedimentary
B. igneous
C. metamorphic
Identify the correct option from the choices provided and respond with the letter of the correct option.

B