求助nn一道逻辑~

In an experiment, two different types of recorded music were played for neonates in adjacent nurseries in a hospital. In nursery A, classical music was played; in nursery B, rock music was played. After two weeks, it was found that the babies in nursery A cried less, suffered fewer minor ailments, and gained more weight than did the babies in nursery B.

Which of the following additional experimental data would support the hypothesis that classical music is beneficial to the development of newborn?(A) The neonates in a nursery where no music was played fared better than those in nursery B.

(B) Nursery A contained 15 percent more premature babies than nursery B.

(C) The newborns in nursery A cried less, suffered fewer minor ailments, and gained more weight than did newborns in a nursery with no music.

(D) The music played in nursery A was louder than that played in nursery B.

(E) The ratio of nurses to newborns in nursery B was 1 to 4; in nursery A, it was 1 to 6

为嘛E不对呢？？？？？？C也没有解释说A就会比B好啊，万一B的小孩也哭得比没音乐的少呢？？？

分组问题，一般都是一个套路做下来的。

A和B两种模式，经过一段时间，出现不同结果，问假设。

通常答案是两个组进行实验前是一样的，或者证明跟实验前是变化了的。

这道题就是，跟实验前的一组比较变化，说明a组的变化是有benefit，而不是rock让b decline了

我觉得这道题可以这么想，A\B两组比较的基础应该是除了所听音乐不同，其他方面都相同。C选项里面，与一组没有听音乐的newborn相比较，就是想要说明，除了音乐没有其他因素不同~

LZ，看看这样是不是可以理解