Answer: Ben
Explanation: Ben is the least likely to be upset by reprimand due to two characteristics features which hugely influence an individual's emotional state.
Ben being the oldest of the group in terms of age should possess more experience and understanding, better emotional control usually due to learning from experience or past events.
Ben is also a male, From. Research studies, The female sex possess higher level of emotion than male. Male seems more hardened and as much gain more control over their emotion than females.