Which detail from the passage shows the connection that author makes between feedback and performance?

A. "A new pair of smart glasses uses a technique invented at NASA to measure users' brainwaves and tell them how well they're paying attention." (paragraph 1)

B. "More and more of a pilot's job was being done by automated programs, and researchers were becoming concerned that pilots, being less engaged, would have trouble maintaining focus." (paragraph 3)

C. "… subjects who were shown their engagement level while performing a task were able to learn to control their concentration and outperformed control groups while reporting a lower perceived workload." (paragraph 5)

D. "'…the user gets to choose the activity,' Greco said. 'And because they're choosing, they're more engaged and having a more successful outcome.'" (paragraph 11)