Final answer:
In 'The Alchemist' by Paulo Coelho, the old man advises Santiago to follow omens because they guide one's destiny, helping to navigate one's path towards their personal legend.
Step-by-step explanation:
The question you've asked is referencing the novel The Alchemist by Paulo Coelho, where the old man, who reveals himself as the king of Salem named Melchizedek, advises the young shepherd Santiago to follow omens. The correct answer to why the old man tells Santiago to follow omens is B) Omens guide one's destiny. In the context of the novel, omens are seen as indicators or signs from the universe that guide a person towards their personal legend or true purpose in life. Santiago is encouraged to pay attention to these omens as they are meant to guide him on his journey to discover his personal legend. It is through the interpretation of omens that Santiago is able to navigate his path and make choices that align with his true desires and destiny.