Answer:
It is C: Contemplative thinking.
Explanation:
Contemplative means 'meditative' and it is related to quiet and serious thought for a long period. Contemplative thinking could be translated into a series of visions derived from deep and meaningful thoughts.
Being contemplative requires a specific mood and environment, mostly quiet and relaxing, in order to achieve peace and ease of mind, so the setting presented would be the most appropriated for a character because it is calm and peaceful, and it is surrounded by serene nature (an island, brilliant water, palms waving, a single gull).
