Here's a problem to solve: Tori made some observations about a grasshopper she saw on a nature walk. Which statement about the grasshopper is a scientific observation?

Among the 4 following options, which is the correct answer?

- A: The grasshopper is pretty.
 
- B: The grasshopper is dangerous.
 
- C: The grasshopper is better than a spider.
 
- D: The grasshopper is smaller than the leaf.
 