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I wanted to translate this sentence on Duolingo:
"Which idea are they choosing?"
I used:
"quelle idée est-ce qu'ils choisissent"
I believe I could use the following sentences instead:
"Quelle(s) idée(s) choisissent-ils/elles."
Ils/Elles choisissent "quelle(s) idée(s)."
But I don't understand why the sentence I used is not correct. I would appreciate if you could tell me.
(Thanks @jlliagre for the help)
Quelle idée choisissent-ils/elles ? (formal; inversion)
Laquelle de ces idées choisissent-ils ? (another formal option)
Ils/elles choisissent quelle idée ? (middle register)
Quelle idée ils/elles choisissent ? (probably the most common middle register)
C'est quelle idée qu'ils choisissent (another option) ?
Quelle(s) idée(s) est-ce qu'ils/elles choisissent ?
Quelle idée est-ce qu'ils choisissent ? is not unheard but not very idiomatic and would be perceived as broken grammar because quelle is already introducing a question so est-ce que is redundant.
