单选题 One comparison mentioned in the last paragraph was made between ______.

A、 Pacific test participants and those who undertook the Nevada test
B、 Nevada atomic veterans and those who didn't take part in any nuclear tests
C、 Veterans in Nevada and Pacific atomic tests and the comparison group
D、 half of Nevada test participants and half of the group of no test participants

【正确答案】 C

【答案解析】[解析] 从最后一段内容可知，这项对比是在参加内华达州或太平洋的原子能试验的老兵和对照组之间进行的。因此C项为正确答案。