I'd say C. volatile, because volatile means "liable to change rapidly and unpredictably, especially for the worst."
Answer:
The answer is Personification.
Explanation:
Personification is used to give human qualities to non-living things. For example: The sun smiled at us. Smile is a human quality given to a non-living thing like the sun.
In the example above, the words sadly and remembered makes this a Personification.
The schoolhouse in this case is a non-living thing. Yet, it is described as feeling sadness and remembering the school children.
Sadness and remembering are human qualities that were given to the non-living abandoned schoolhouse.
Hence, "The abandoned schoolhouse sadly remembered the happy laughter of children" is an example of personification.
