Which word means to be completely covered or absorbed in something?

The correct choice, which is "immersed," means to be completely covered or absorbed in something, particularly in a way that suggests deep involvement or engagement. When someone is immersed in a task, for instance, they are fully committed and focused, often losing track of their surroundings. This term conveys a sense of depth in the experience, whether it's a physical state, like being submerged in liquid, or a mental state, such as being absorbed in a book or project.

While the other words present similar concepts, they do not capture the essence of being "immersed" as effectively. "Enveloped" suggests being wrapped or enclosed, but it lacks the implication of active involvement or engagement. "Engulfed" denotes being swallowed up or overwhelmed, which carries a more negative connotation of being consumed by something potentially uncontrollable. "Submerged" typically refers to being under water and may not imply the level of engagement or intentionality that "immersed" does. Thus, "immersed" stands out as the most precise term to describe a complete absorption in something.