Statement A is correct: Machine learning (ML) is a subset of Artificial Intelligence (AI). ML is a method that enables systems to learn from data without explicit programming. Statement B is incorrect: Supervised learning involves training a model using labelled input data (pairs of inputs and corresponding desired outputs). Unsupervised learning uses unlabelled data. Statement C is correct: Reinforcement learning is a type of machine learning where an agent learns to take actions in an environment to maximize a cumulative reward. This learning process often involves trial and error, where the agent receives positive or negative feedback (rewards or penalties) based on its actions.