Which of the Following Is an Example of Problem-Focused Coping

Which of the following is an example of problem-focused coping?

A) Layla meets with her manager to discuss her feelings of failure after her new packaging design was rejected by the marketing department.
B) When Josiah was unable to find the source of a bug in a smartphone app he was testing, he set that task aside and worked on something else.
C) In order to meet a pending deadline, Ava chooses to wear noise canceling headphones and set her phone to ring through to voicemail while she focuses on achieving her goal.
D) Kai reassessed his feelings of inadequacy after being passed over for a promotion and decided to see it as an opportunity to reengage with the job he has rather than the job he wants.
E) Because Cora was always being asked by her boss to stay late on Fridays to finish last-minute tasks, she elected to take advantage of the company's telecommuting policy and work from home on Fridays instead.