If two objects are entering a zone simultaneously, which determines the order of their timestamps?

In Magic: The Gathering, when two objects are entering the battlefield simultaneously and need to be ordered for timestamps, the active player determines the order. This is outlined in the rules regarding how timestamps are assigned, specifically in the context of multiple objects entering the battlefield at the same time.

The active player is the player whose turn it is, and they control the progression of the game during their turn. When actions occur simultaneously, the active player gets to decide the order of these actions. This means that if two or more permanents are entering the battlefield at the same time, the active player will choose which permanent's timestamp is applied first, and this can affect interactions such as whether one permanent's effects or abilities trigger before another's.

The other options do not relate to the rules governing the resolution of simultaneous events in this scenario. The number of cards in hand or the highest life total does not influence the order of timestamps, as these factors are irrelevant to the mechanics of entering the battlefield. The phrasing about whose turn it is may seem close conceptually but ultimately aligns with the rule that cites the "active player" directly as the determining factor, making it clear that the active player has the decisive role in establishing that order.