如何显示selectOption数组中的值？

Question

如何将答案保存在selectOption数组中？ 考试阵列内部有问题 和selectOption数组必须具有用户选择的答案

  constructor(props) {
    super(props);
    this.handleOptionChange = this.handleOptionChange.bind(this);
    this.state = {
      exams: [],
      selectedOption:[],

    };
  }
  getStepContent(step) {
    let i = 0
    for (i=0; i < this.state.exams.length;i++){
    switch (step) {
      case i:
        return(
          <div>
            <div>
              <FormControl component="fieldset">
                <FormLabel className="QuestionBox" >{i+1}-{this.state.exams[i].text}</FormLabel>
                <RadioGroup value={this.state.selectedOption[i]} onChange={this.handleOptionChange}>
                  <FormControlLabel checked={this.state.selectedOption[i] === this.state.exams[i].ig1} value={this.state.exams[i].ig1} onChange={this.handleOptionChange} control={<Radio />} label={this.state.exams[i].ig1} />
                  <FormControlLabel checked={this.state.selectedOption[i] === this.state.exams[i].ig2} value={this.state.exams[i].ig2} onChange={this.handleOptionChange} control={<Radio />} label={this.state.exams[i].ig2} />
                  <FormControlLabel checked={this.state.selectedOption[i] === this.state.exams[i].ig3} value={this.state.exams[i].ig3} onChange={this.handleOptionChange} control={<Radio />} label={this.state.exams[i].ig3} />
                  <FormControlLabel checked={this.state.selectedOption[i] === this.state.exams[i].ig4} value={this.state.exams[i].ig4} onChange={this.handleOptionChange} control={<Radio />} label={this.state.exams[i].ig4} />

                </RadioGroup>

              </FormControl>

            </div>
                     </div>

        );