It has to be a, b or d then.
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A, because its still water, just in a different state.
When entering the stomach, the food is broken down and the nutrients are absorbed by the body to provide energy and nourishment. The rest of what's left gets discarded out of your body.
Starch blocker help prevent the body from absorbing starches so you don't absorb calories, and fat blockers are kind of the same thing, they don't let your body absorb fat, instead it excretes it as waste.
B THEY RELEASED CARBON DIOXIDE, WHICH EVOLVING ANIMALS NEEDED.