Final answer:
Gases in lava produce bubbles, which create vesicular textures in igneous rocks like basalt and contribute to the explosive character of volcanic eruptions. Hence, the correct answer is option B.
Step-by-step explanation:
Gases in lava produce bubbles. When lava flows from a volcano and begins to cool, gas trapped within it cannot escape and forms bubbles within the hardening material. This can be seen in samples of rock formed from lava, such as basalt from the lunar mare surface, which exhibit holes left by these gas bubbles.
The presence of these bubbles is a common feature in igneous rocks, which form as molten rock cools and solidifies. For instance, volcanic glass such as obsidian is formed by the rapid cooling of viscous lava, which doesn't allow time for crystal formation, and therefore it appears glassy with a random arrangement of atoms.