Does my opponent choose which card to trash according to this [On Play] effect?

Yes, your opponent, as the owner of the hand, chooses which card to trash.

[P-048] - Arlong (One Piece Promotion Cards: Sealed Battle Kit Vol. 1) - One Piece Card Game

[DON!! x1] [When Attacking] If you have 4 or more Life cards, your opponent places 1 card from their hand at the bottom of their deck.

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