老师这个题不是很理解

NO.PZ2016021705000038问题如下 If two companies have inticunit sales volume anoperating risk, they are most likely to also have intical:A.sales risk.B.business risk.C.sensitivity of operating earnings to changes in the number of units proceansolis correct.The companies’ gree of operating leverage shoulthe same, consistent with Sales risk refers to the uncertainty of the number of units proceansolanthe priwhiunits are sol Business risk is the joint effeof sales risk anoperating risk.不理解为什么选C，麻烦再一下

NO.PZ2016021705000038 business risk. sensitivity of operating earnings to changes in the number of units proceansol is correct. The companies’ gree of operating leverage shoulthe same, consistent with Sales risk refers to the uncertainty of the number of units proceansolanthe priwhiunits are sol Business risk is the joint effeof sales risk anoperating risk.L的计算不是也跟P有关么

NO.PZ2016021705000038 不是很明白老师课上讲的 杠杆来源于固定成本。杠杆难道不是来源于借债么？用不属于自己的钱来赚钱，收益和损失都会放大。固定成本是不论接不接债一直都有的，这个杠杆是怎么说呢？又怎么理解 有固定成本的all equity的公司 的杠杆呢？ L是EBIT变动1%，sales变动多少%，L为什么可以衡量杠杆呢？感觉只是简单的衡量两个指标变动的相关性，跟杠杆没有关系呀

为什么B不对？