Prep 159 语法求助

The first detailed study of magpie attacks in Australia
indicates that by the time they had reached adulthood, 98 percent of men and 75 percent of women born in the country have been attacked by the birds.
A.by the time they had reached adulthood, 98 percent of men and 75 percent of women born in the country have been attacked by the birds

B.by the time they reach adulthood, 98 percent of men and 75 percent of women, who were born in the country, had been attacked by the birds

C.by the time they reached adulthood, 98 percent of men and 75 percent of women born in the country had been attacked by the birds

D.98 percent of men and 75 percent of women that were born in the country were attacked by the birds by the time they reach adulthood
E.98 percent of men and 75 percent of women who were born in the country, by the time they reached adulthood had been attacked by the birds

答案是C 可是我觉得先出现they，后面才出现主语很奇怪啊。