[Solved] When does a negative externality exist? A)When there are quantity controls in a market B)When there are price controls in a market C)When the marginal social cost of producing a good or service exceeds the private cost D)When the marginal private cost of producing a good or service exceeds the social cost Nude Female's Picture: An image depicting a woman without clothes, often considered in contexts ranging from art and photography to issues of privacy and consent. Increased Heartbeat: A physiological response where the heart rate speeds up, which can occur due to various factors such as exercise, stress, or fear. Variable-Interval Schedule: is a type of reinforcement schedule in which responses are rewarded after unpredictable time intervals, leading to consistent and stable response rates over time. Fixed Amount of Time: A specific, unchangeable duration designated for a particular task or activity.