Final answer:
In 'The Alchemist', Santiago is urged to seek treasure at the Pyramids by a mysterious child in his recurring dream, none of the listed options matches exactly, but 'b) A mysterious voice' is closest to the text.
Step-by-step explanation:
In the novel The Alchemist by Paulo Coelho, the protagonist Santiago experiences a recurring dream while sleeping in an abandoned church. This dream is significant as it serves as the impetus for his journey. In the dream, Santiago is encouraged to seek treasure at the Pyramids of Egypt.
The figure who inspires Santiago to embark on this quest is a mysterious child, not any of the characters listed in the options provided. The mysterious child tells Santiago about the treasure, prompting his quest to find it, which becomes the central plot of the story.
Therefore, while none of the given options precisely match the dream's character, the correct answer would be 'b) A mysterious voice', as it is the closest to the actual occurrence in Santiago's dream.