在这几个选择当中，我觉得这个最合适。

Zài zhè jǐ gè xuǎnzé dāngzhōng, wǒ juéde zhè gè zuì héshì.

Among these choices, I think this one is the most suitable.

在大家的讨论当中，他一直很安静。

Zài dàjiā de tǎolùn dāngzhōng, tā yìzhí hěn ānjìng.

During everyone's discussion, he stayed very quiet.