An model class representing a Question Field in Google Forms...

GoogleFormField.cs

// using System.Collections.Generic;

/// <summary>
/// A Question Field in a Google Form
/// </summary>
public class GoogleFormField
{
	/// <summary>
	/// Type of the Question Field
	/// </summary>
	public GoogleFormsFieldTypeEnum QuestionType { get; set; }

	/// <summary>
	/// Question text of the Field
	/// </summary>
	public string QuestionText { get; set; }

	/// <summary>
	/// The unique Id need to be used 
	/// when submitting the answer
	/// I also refer to this as: Field Id
	/// </summary>
	public string AnswerSubmissionId { get; set; }

	/// <summary>
	/// Available Answer List for any kind of 
	/// multiple answer selection field
	/// </summary>
	public List<string> AnswerOptionList { get; set; } = new List<string>();

	/// <summary>
	/// If the answer is required to Submit
	/// </summary>
	public bool IsAnswerRequired { get; set; }
}