单选题 Why does the author say reducing the amount of meat in one's diet is environmentally beneficial?

A、 People who eat meat usually have weaker immune systems compared to those of vegetarians,
B、 A lot of food and water are consumed in order to raise livestock.
C、 90% of animals are raised in confinement.
D、 Raising Animals causes most of the destruction of the nature.

【正确答案】 B

【答案解析】推理判断题。作者从不同角度说明了少吃肉的好处，第二段是营养上的好处，第三段提到大量的粮食和水用于饲养肉食动物，暗示饲养肉食动物对资源的浪费。第四段提到由于饲养方式的原因，吃肉还引出道德问题。根据第一段和最后一段的意思，吃肉在三方面有害，所以可以确定第三段的内容与环境有关。