Final answer:
The three aspects of the natural world that are personified during Santiago's efforts to transform himself into the wind are sand, sun, and stars.
Step-by-step explanation:
Based upon the definition provided, wherein the term pathetic fallacy applies to instances where parts of the natural world are given human traits, the answer to the question regarding the three aspects of the natural world personified during Santiago's efforts to turn himself into the wind is B) Sand, sun, and stars. In Paulo Coelho's novel 'The Alchemist', Santiago speaks to the desert, the sun, and ultimately the wind as if they were sentient beings capable of understanding and assisting him in his quest to demonstrate his ability to become the wind. These elements of nature are personified, attributing them with the human characteristics of communication and comprehension, to help in Santiago's transformation.