People Often Describe Flow as Being "In the Zone" and Report

Multiple Choice

People often describe flow as being "in the zone" and report heightened states of clarity, control, and concentration. In which of the following scenarios would the person involved most likely experience a flow state?

A) Ibuki stands at a machine, punching out the same parts day after day.
B) Hyata enjoys research even though his present research task is not demanding.
C) Mark has been trying to create a good project proposal, but he feels out of his depth.
D) Leslie has been using her skills to write a proposal for a project that will be challenging.
E) Louise has been stamping envelopes for hours, a task she finds repetitive and boring.