Final answer:
The correct answer is option a) Theory of mind.
Step-by-step explanation:
The idea that people who see something also know about it reflects a type of understanding referred to as theory of mind. Theory of mind is the ability to attribute mental states—beliefs, intents, desires, emotions, knowledge, etc.—to oneself and others and to understand that others have beliefs, desires, intentions, and perspectives that are different from one's own. This cognitive ability is significant in human development as it enables individuals to understand and predict the behavior of others, which is essential for social interactions.
Theory of mind develops in children and is a step beyond object permanence, which is the understanding that objects continue to exist even when they cannot be observed. As children grow, they also outgrow egocentrism, which is the inability to perceive a situation from another's point of view, an attribute commonly found in younger children who have not yet developed theory of mind.