I would happen to believe the answer is We hiked up silver park yesterday.
This would be because all the other sentence are detailed and longer and that one is small and just gets to the point. Hope I helped!
Answer:
he doesn't study hard is the negative form.
The answer is the last one, D. All of the other transitions indicate that the writer will either go into further detail on the subject or list other reasons as to why this would be correct. However, D clearly uses a contrasting transition to introduce a new argument.