PLEASE HELP Which of these would be labeled as an elaboration sentence in Source 3?

Question 4 options:

“It was about halfway through the flight home last night that both of my kids looked up at me with sad faces.”

“These experiences then turn on the genetic expression of key brain fertilizers in the frontal lobes, Dr. Sunderland explains, enhancing executive functions like stress regulation, attention, concentration, good planning, and the ability to learn, and also improving physical and mental health.”

“By using these memories as an anchor to take us back to more cheerful moments, we’re often able to approach problems with a fresh sense of perspective.”