how to decide it?

redpot

Intended primarily to stimulate family summer travel, the new airfare, which allows both and audlt and a child to fly for the price of one ticket, (and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than) fourteen.  

A.
B. and also lessens the advance-purchase requirement for family travel to a seven-day minimum from
C. also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than that of
D. also lessens the advance-purchase requirement for family travel to seven-day minimum
E. also shortens the davance-purchase requirement for family travel to a minimum of seven days rather than

primefang

从意思上考虑，如果C 正确，不会有两个 minimun （最小）存在

redpot

How about C?

sunny

如果不用shorten,用什么呢？requirement 一般是不能用shorten，但是习惯表达就是the advance-purchase requirement ，这是专有的名词，实际上等于时间，所以就可以用了。

primefang

虽然是最佳答案,但我也觉得读来不爽,有人可以解释以下吗?

dalaju

what I mean is, 可以有shorten the requirement这个用法吗？

zinco

here, "shorten" is a verb, not an adjective.

dalaju

问：shorten 修饰的是requirement吗？

tongxun

B 使句子fragment

redpot

how about B?