Answer:
The answer is D- Flow
Explanation:
The concept of flow is a term in psychology that describes one's mental state of operation in which the individual is completely involved, absorbed or focused in a certain activity at a certain time. The individual experiences a feeling of energized focus and enjoys the activity in which he or she is focused on. Carson in this instance enjoys writing mystery novels and he becomes so focused as he writes to the extent that he looses track of time, this explains the concept of flow.