Answer: As Santiago continues his journey with the alchemist, he learns several new lessons about himself and his abilities. First, the Alchemist explains that each person's heart emerges from the Soul of the World. Because Santiago's heart connects him to the Soul of the World, Santiago must learn to listen to it properly.
The correct answer is A) effect. The verb is 'to affect', but the noun is 'effect'. You can affect someone by doing something, or you can have an effect on them.