Some students must cross a shallow creek to get to school. However, when they walk in the creek, they damage the habitat of native insects and small animals on the creek bottom.

How should the students define the problem so that they can begin to solve it?
Answer options with 4 options
A.
People need to cross the creek without affecting native species.
B.
People need to study the native species to learn how humans affect them.
C.
People need to test solutions like moving the native species to another creek.
D.
People need to investigate the role of native species in the creek environment.