8. Which of the following best completes the passage below?

At large amusement parks, live shows are used very deliberately to influence crowd movements. Lunchtime performances relieve the pressure on a park’s restaurants. Evening performances have a rather different purpose: to encourage visitors to stay for supper. Behind this surface divergence in immediate purpose there is the unified underlying goal of______

(A) keeping the lines at the various rides short by drawing off part of the crowd

(B) enhancing revenue by attracting people who come only for the live shows and then leave the park

(C) avoiding as far as possible traffic jams caused by visitors entering or leaving the park

(D) encouraging as many people as possible to come to the park in order to eat at the restaurants（E）

(E) utilizing the restaurants at optimal levels for as much of the day as possible

这一个题我觉得b和d也有道理亚，以前大家都没有提问过，是我太弱了～～～，不过还是不太明白，向大家求教了

我个人认为，它白天要缓解餐厅就餐压力，也就是说，让尽可能多的人去餐厅吃饭。因为如果不缓解的话，potential客人可能就不会留下来吃饭了，致使餐厅收入减少。那么晚上，它就有意增加餐厅就餐的人数。两种措施都是为了让餐厅创收而设置的。

不知道这样理解行不行，还望大NN指点。