Answer:
D. Sara needs to take a break and come back later.
Step-by-step explanation:
Hitting the wall shows how frustrated he must have been while trying to troubleshoot the problem.
Taking a break will give him time to calm his nerves, properly think about the possible solutions he has evaluated and a chance to refocus on the task at hand.
Other benefits of taking break
1. It reduces stress
2. It prevents straining the eyes
3. It serves as a creativity boost
Among others...