1-C. That would kill two birds with one stone!That would kill two birds with one stone!
それは、二羽の鳥を殺すでしょうね、一つの石でダヨ!
killing[名詞]殺害
2-C. I was carrying almost 30 kilograms, and it was killing me.I was carrying almost 30 kilograms, and it was killing me.
私は、ほぼ30キログラムを運んでいました、そして、それは、私を殺していました。
killed殺される
3-C. Spending less time outside the home searching for food reduces the risk of being killed by other animals.Spending less time outside the home searching for food reduces the risk of being killed by other animals.