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を選んだの

chose …?

→ を
phrase Uncommon #19,086
chose …? The particle を marks what was chosen. の often gives the question a conversational or explanatory tone; the phrase can also occur in a statement depending on context and intonation.
JA: どの色を選んだの？
EN: Which color did you choose?

なぜこのような科目を選んだの？

Why did you choose a subject like this?

どの方法を選んだの？

Which method did you choose?

どうして私を選んだの？

Why did you choose me?

— ふたりのベロニカ (1991)

「神様!誰がこの人達を選んだの？」「神様がこの人達を選んだんだよ」

“God! Who chose these people?” “God chose them.”

私は自由を選んだの

I chose freedom.

— ブレードランナー 2049 (2017)

なぜあなたはシェイファーを選んだの？

Why did you choose Schaefer?

— セッション (2014)

どの方向を選んだの？

Which direction did you choose?

誰があなたを選んだの？

Who chose you?

これを選んだの？

Did you choose this?