请教一个问句的意思

Helmet_007

In a certain medical survey, 45 percent of the people surveyed had the type A antigen in their blood and 3 percent had both the type A antigen and the type B antigen. Which of the following is closest to the percent of those with the type A antigen who also had the type B antigen?




请问Which of the following is closest to the percent of those with the type A antigen who also had the type B antigen?是什么意思？看解析应该是问既有typeA又有typeB的人占所有typeA的人数的比例，那么这个问题的句子成分是什么呀？

yichenghaha

应该是问那些AB都有的人 占有A的人的百分比是多少，看题目应该是百分之十五