On an expedition, you find a huge area filled with rock formed from lava. The lava seems to have slowly seeped from the crust, is primarily made of basalt, and doesn't show signs of having been explosive. Based on this data, which answer is most likely correct about this volcano? A: It is from a recent eruption.
B: It formed on a divergent plate boundary.
C: It formed on a subduction zone.
D: It was found using seismographic data.