Reflexive writing is written for publication, while extensive writing is written for the classroom. Reflexive writing is not meant to be shared, while extensive writing is. Reflexive writing is used by accomplished writers, while extensive writing is used by beginning writers.
The answer should be D) because A) is not tension, B) is really not tension, and C) is not suspense either so I would go with D) since we don't know what they're talking about and why so quiet.