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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.
(c)also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than that of
(E)also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than
(c)that 指代 a minimum 答案说少了介词to(感觉并列题中若动词后又介词，and 后就一定要加介词，不知道这种感觉对伐), 且原意改变了，但我觉得意思是从最短需要14天改到最短需要7天，没改变意思啊
且求教什么时候要加"that of ",什么时候不需要加"that of " | 
