LZM语法22页说，“numbers of ＋ 可数名词必错”。但第2页的例题如下，

The speculative fever of the Roaring Twenties infected rich and poor alike; vast quantities of people were dangeoulsly overextended, credit was absurdly easy to obtain, and most brokerage houses required only ten percent cash for stocks bought on "margin".

A rich and poor alike; vast quantities of people were dangeoulsly overextended

B both rich and poor alike; large amounts of people dangerously overextended themselves

C rich and poor alike; great numbers of people were dangerously overextended themselves

D both rich and poor alike; vast amounts of people dangerously overextended themselves

E both rich and poor; great quantities of people were dangerously overextended

选C因为quantities和amount修饰可数名词people是错的，所以选C numbers of people，但和上面的语法点是矛盾的。

不知哪位N人可以解答一下？