关于一道feifei数学题的疑问

PART7里有一道题：

86、If n is an integer and not prime number,then n must be
(A)the total of three prime numbers
(B)the difference between two even numbers
(C)the difference between one even number and one odd number
(D)the product of one even number and one odd number
(E)the product of prime numbers.
【答案】E
【思路】
任何一个自然数都可以表达成为质因子的分解。

我想问，如果n=1（1是整数且不是质数），那E也不对了。

谢啦~

咋木有人呢

貌似楼主是对的，题目不严谨吧 。。。