Pick up insects with bare hands. Stay with a classmate at all times. Reach under large rocks without looking first. Work away from the group.
Students go on a class field trip to collect insects. Which of these is an important safety rule for the students to follow?

Options:
- Pick up insects with bare hands.
- Stay with a classmate at all times.
- Reach under large rocks without looking first.
- Work away from the group.

Stay with a classmate at all times.