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Simultaneous triggers are resolved in the order you choose, but when do you choose the order? Is it when they trigger, or as each resolves? Example: Abilities A, B, and C all trigger simultaneously. Can I resolve A, see the results of that, and then choose whether I want to do B or C next?

Yes. You choose which to use one at a time.
Source: Wizards of the Coast (2019-04-12)    【Link to Ruling】
Tags: Triggers