"I left it up to the person who suggested it. That's alright isn't it?"
"I left it up to the person whose idea it was. That's fine right?"
"I left it up to the person who suggested it. That's alright isn't it?"
"I left it up to ~" 「〜に任せることにした」
"the person who suggested it" 「言い出しっぺ」
"That's alright isn't it?" 「それでいいよね?」
"I left it up to the person whose idea it was. That's fine right?"
"the person whose idea it” 「言い出しっぺ」
"that's fine right?" 「それでいいよね?」