Final answer:
The best conclusion sentence for a student essay about a class hike is option c)"In the end, nature provided us with unexpected but valuable insights."
Step-by-step explanation:
The sentence that would provide the best conclusion to a student essay about a class hike is:
c) In the end, nature provided us with unexpected but valuable insights.
This sentence effectively summarizes the main idea of the essay by emphasizing the valuable insights gained from the hike. It also highlights the unexpected nature of these insights, making the conclusion more interesting and engaging for the reader.