The correct answer is a.: specific.
This structure (this +adj) requires an adjective and the only adjective is in a., the other options are verbs or nouns and are not correct.
Answer:
Where you only give the main points from a source: Summary
A portion of a text that is 4 lines or longer: Long quote
When you use your own words to talk about what happened: Paraphrase
A portion of a text that is less than 4 lines: Short quote
Answer:
William Sydney Porter, otherwise known as O. Henry, is released from prison on this day, after serving three years in jail for embezzlement from a bank in Austin, Texas.
Answer:
no hay una respuesta específica
Is it the background of the story? Prequel? Maybe? Idk