885-21-14 shorten the requirement?

gmatchenaimin

Intended primarily to stimulate family summer travel, the new airfare, which allows both an adult 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) and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than
(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 a seven-day minimum from
(E) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than

key: E
搜索了以前的贴子, 讨论集中在"rather than"上, 好象没有人对"shortens the ...requirement"提出问题. 我觉得这种用法不符合习惯表达. 倒是"lessens ... requirement"恰当. 哪位NN提出高见.

tonylin0824

shorten days 缩短天数 固定搭配 

lessen days 没有这种搭配

而不是 shorten requirement