Letter C is the correct answer.
Work activities are most likely to foster hapiness when these activities promote the experience of flow. Flow is a very enjoyable state of being and can happen in different ways for different people: it doesn't only help us to feel happier, but also more creative and productive in our daily tasks.
Answer:
1) 3,778
2) Paradisus, Punta Cana - Resort ($3,780)
3) Go on the beach and all the other activities the resort offers
4) 5 days
5) 2978 (resort, everything included) 800 (for the plane tickets)
For the pictures just look up Paradisus, Punta Cana - Resort