Statisticians studying the health effects of uranium mining o Navajo communities have found others besides miners and millworkers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in nonmining communities.
A children's cancer, and altered birth ratios of males and females are much higher
B cancer among children, and altered male and female rations at birth are much higher
C cancer among children, and altered birth ratios of males and females occur much more frequently
D altered birth ratios of males and females, and children's cancer are much higher
E altered male and female ratios at birth, and cancer among children occur much more
The answer is C
但我看到cancer among children就會覺得改變句意
為什麼不能選A呢?