The 3C concept of user stories consists of three elements: card, conversation, and confirmation12. The card is a written description of the user story that captures the essence of the feature or functionality from the user’s perspective. The conversation is a dialogue between the product owner and the development team to clarify the details, assumptions, and expectations of the user story. The confirmation is a set of criteria or tests that verify that the user story is implemented correctly and meets the user’s needs12. Therefore, by applying the 3C concept, the correct statement is A, as the conversation should include the acceptance criteria discussion. This will help the team to understand the scope, priority, and value of the user story, as well as the conditions of satisfaction that the product owner expects12. The other statements are incorrect, as they violate the 3C concept. Statement B is wrong, as the card should contain the user story, not the requirements. The user story is a brief and informal way of expressing the user’s goal and benefit, while the requirements are more detailed and specific descriptions of how the software should work. The requirements can be added later as part of the conversation or confirmation12. Statement C is wrong, as the product owner has written a user story, but confirmation is still needed. The confirmation is a vital part of the 3C concept, as it ensures that the user story is testable, measurable, and verifiable. The confirmation also helps to avoid ambiguity, misunderstanding, or disagreement between the product owner and the development team12. Statement D is wrong, as the conversation is required and the team should not start developing without it. The conversation is an essential part of the 3C concept, as it allows the team to ask questions, share ideas, and collaborate with the product owner to refine the user story and reach a shared understanding. The conversation also helps to identify the dependencies, risks, and assumptions that may affect the implementation of the user story12. References: ISTQB Foundation Level Agile Tester Syllabus1, Section 2.2.1, page 16-17; Effective User Stories - 3C’s and INVEST Guide2, Section The 3 C’s (Card, Conversation, Confirmation) of User Stories.