An effect is said to "depend on" another effect in which of the following situations?

An effect is said to "depend on" another effect in situations where applying one effect influences the outcome of the other. This occurs in specific contexts within the game.

When two effects are applied in the same layer, they operate simultaneously and can interact with one another. For example, if one effect modifies a creature’s power and another modifies its toughness in the same layer, the final characteristics of the creature might depend on how these effects interact.

Additionally, if applying one effect alters the text or existence of another effect, the result is a clear dependency. For instance, if an effect causes a permanent to lose a specific ability or becomes the target of another effect that cannot exist without that ability or characteristic, the first effect directly influences the outcome of the second.

Both of these scenarios—effects operating in the same layer and one effect altering the presence or wording of another—demonstrate situations where dependency is established. Options that assert these conditions reinforce our understanding of how effects interact and depend on each other within the rules of Magic: The Gathering.

Thus, the correct choice encapsulates both instances of dependency, affirming their coexistence in determining interactions in gameplay.