I think it might be sentence 4, since it is not relevant to the wooly mammoth's disappearance.
The answer would be A. became
Answer:
Gothic novels
Explanation:
A Gothic novel uses elements of fear, death and horror as a basis for its story line. Sometimes romantic elements can be included as well. Public and private life conflict becomes a common theme as this is mostly fiction where an individual is trying to balance the mysteries of his private life while at the same time maintaining a public persona.
