A function that returns the color of an option based on whether the option is correct and whether the option is selected.

quiz_options.dart

void main(List<String> arguments) {
  options = ['Multiply', 'Dart', 'Function', 'Gold', 'Silver', 'Bronze'];

  String getColorForOption(String answer) {
    bool correctAnswer = answer.startsWith("S");
    bool isSelected = answer.startsWith("D");
    if (isSelected) {
      return correctAnswer ? 'Green' : 'Red';
    } else {
      return correctAnswer ? 'Green-Correction' : 'Grey';
    }
  }

  for (var answer in options) {
    print(getColorForOption(item));
  }
}

Output

Grey
Red
Grey
Grey
Green-Correction
Grey