how can I know what I select in every group

[Zen05]

I want to know what i select in every group ,but i can't do it. everybody hlpe me, please this is my data

this is this.state.data: Array [
 Object {
   "A": "采取国务院发布的放假方案调休，共四天假期",
   "B": "在上述方案下再将前一周的周六调至五一假期中，共五天假期",
   "C": null,
   "D": null,
   "qid": 1,
   "tid": 1,
   "title": "五一即将来临，我们将对五一的休假计划做意见收集",
 },
 Object {
   "A": "不补假",
   "B": "补周一的假",
   "C": "补周二的假",
   "D": "补周3的假",
   "qid": 1,
   "tid": 2,
   "title": "五一补假方案",
 },
 Object {
   "A": "参加",
   "B": "不参加",
   "C": null,
   "D": null,
   "qid": 1,
   "tid": 3,
   "title": "五一是否参加学校组织的活动",
 },
 Object {
   "A": "不去玩，认真学习",
   "B": "在家自己玩",
   "C": "找朋友玩",
   "D": "出去玩",
   "qid": 1,
   "tid": 4,
   "title": "五一不参加活动你去哪里玩",
 },
]

this is my demo

    onSelect=(index, value)=>{
        console.log(`you select ${index} and result is ${value}`)
        this.setState((prevState)=>{
            var arr = prevState.select;
            arr[index]=value; 
            return{
                select: arr
            }
        })
      }
     this.state.data.map((values,index)=>{
                            var {A,B,C,D,E,F,G,H,I} = values;
                            return (
                            <View
                                key={values.title}
                            >
                                <View style={{marginTop:15}}>
                                    <Text>{`${index+1}.${values.title}`}</Text>
                                </View>
                                <RadioGroup
                                    key={index}
                                    onSelect={(index, value) => this.onSelect(index, value)}>

                                    <RadioButton value={`A`}>
                                        <Text>{`A.${A}`}</Text>
                                    </RadioButton>

                                    <RadioButton value={`B`}>
                                        <Text>{`B.${B}`}</Text>
                                    </RadioButton>

                                    <RadioButton value={`C`} style={{display: C ? "flex" : "none"}}>
                                        <Text>{`C. ${C}`}</Text>
                                    </RadioButton>

                                    <RadioButton value={`D`} style={{display: D ? "flex" : "none"}}>
                                        <Text>{`D. ${D}`}</Text>
                                    </RadioButton>

                            </View>)
                        })
                    }