The correct answer is: D. Incredible.
A story that can hardly be believed is an incredible story. An incredible story is one that is so amazing or unbelievable that it is hard to believe that it is true. Incredible stories often involve supernatural elements, such as magic or aliens. They may also be about events that are very unlikely to happen, such as someone winning the lottery or finding a buried treasure.
Fictitious stories are stories that are not true. They are made up by the author and do not have any basis in reality. Imaginary stories are similar to fictitious stories, but they are often more fantastical and less grounded in reality. Concocted stories are stories that are made up in order to deceive or mislead someone. They are often used to cover up a crime or to make someone look bad.
In conclusion, the correct answer to the question “A story that can hardly be believed” is: D. Incredible.