Final answer:
Without specific context, it's not possible to definitively say why the firebird retrieved magic water from the Fountain of Life; it could be for immortality, a tsar's request, wizard's coercion, or out of gratitude, all of which are common motifs in folklore.
Step-by-step explanation:
The question refers to a story involving a firebird and the Fountain of Life. Without a specific tale or context, it's not possible to accurately answer why the firebird retrieved magic water from the Fountain of Life. However, the options provided suggest different motivations that are common in folklore and fairy tales: seeking immortality, fulfilling a request by a tsar, being coerced by a wizard, or acting out of gratitude. In many stories, magical creatures such as the firebird undertake quests for objects of power, like water from the Fountain of Life, for various reasons – personal gain, as a favor for someone else, due to external pressure, or to repay a kindness. These quests often reflect the characters' virtues or flaws, or serve as catalysts for their development throughout the story.