Final answer:
A writer might use synesthesia to create surprising associations between different sensory experiences, thereby evoking emotions and enhancing the text's mood and symbolism.
Step-by-step explanation:
The most likely reason a writer might choose to use synesthesia is C. To create surprising associations with a certain sensory experience. Synesthesia in literature involves mixing sensations or describing one sensory experience in terms of another, such as 'summer tastes yellow.' This literary device can create vivid and innovative descriptions that challenge the reader's typical sensory perceptions, leading to a deeper and more engaging encounter with the text. It can stimulate the reader's imagination, evoke emotions, and make the descriptions in the narrative more memorable. Additionally, synesthesia can also contribute to the mood of the story and enhance the symbolism within the text.