Here's a problem to solve: Which of the following is an observation about grasshoppers that a science class could have made on their nature walk?

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

- A: The grasshoppers will live longest in a container filled with plants.
 
- B: The grasshoppers are green with long back legs and antennae.
 
- C: The grasshoppers will probably eat more grass than tree leaves.
 
- D: The grasshoppers all hatched from eggs laid the year before.
 