Answer:
The correct answer is the option D: No, because statements of pure opinion do not amount to defamation.
Explanation:
To begin with, the fact that Adam have published his personal opinion about a certain topic does not directly indicates that his opinion, in the case of being a hard critic of something, is to be considered a defamation due to the fact that those kind of statements are protected by law in the United States according to the First Amendment to the United States so therefore that his pure opinion is under the freedom of speech regime. That is why that politicians would not be able to sue him for defamation under tort.