Answer: Jamie, Stella and Isaac
Explanation:
For a team with a strong, harmonious culture, which is likely to give the best results, Jamie, Stella and Isaac are a good combination.
Jamie is organized and this is a good thing - someone needs to keep track of deadlines and organize the team. Stella is cooperative and this will strengthen the harmonious culture of the team. Isaac is laid-back and this is a good thing too, as long as he delivers the expected results.
However, Mary not being achievement-oriented is not something to be desired in a team which should give the best results, because she would fall behind and she would drag the team down. She would also be prone to missing deadlines.