A concrete statement can be considered as a 'solid' statement. This means that the sentence must contain hard facts to manifest the credibility of the statement. As much as possible, you give specific examples and provide evidence for this. From the choices, the answer would be D.
In the beginning of "The Great Gatsby", Nick brags that he is not at all judgmental and is able to understand where people are coming from. This leads him to trusting people and thinking the best of them. By the end of the novel, after he has had so many uncomfortable and unfortunate experiences tangled up in the lives of Gatsby, Daisy, Tom, Jordan, etc, Nick finds himself to be very judgmental of their lifestyle and personalities, especially the Buchanans. He removes himself from their company and becomes more reserved, less trusting.
This answer is True Present past and past participle are the three principal parts
I'd say its the second choice
Note, answers can vary, these are just what I would do
1. Insisted
2. Added
3. Argued
4. Agreed
5. Mentioned
