阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
体裁：记叙文 话题：助人为乐 时间：15分钟
On a cold winter day，a group of strangers band together to save three children.
The 30 miles of switchbacks(急转弯) that snake through the pinecovered mountains of Logan Canyon in Utah are enough to make most drivers' hands sweat.
