After the Colonial period’s 50 percent mortality rate, life expectancy improved for children, but as late as the nineteenth century about one child in three died before reaching the age of six.
(A) After the Colonial period’s 50 percent mortality rate, life expectancy improved for children, but
(B) Even though children’s life expectancy, which improved over the Colonial period’s 50 percent mortality rate,
(C) Although life expectancy for children improved after the Colonial period, during which the mortality rate was 50 percent,
(D) While there was an improvement in life expectancy for children after the 50 percent mortality rate of the Colonial period, still
(E) Despite children’s life expectancy improvement from the Colonial period’s 50 percent mortality rate,
答案是C,可是我覺得D優多了,
因為 C 的during which比 D 囉嗦多了,而且D也沒有改變句意
請教各位戰友的意見