Management practices are important because they enable value chain activities by providing the capabilities needed to perform them effectively, so option B is correct. In ITIL, value chain activities are high-level lifecycle activities such as discover, design, build, transition, operate, deliver, support, and acquire. These activities do not happen in isolation. They depend on practices such as architecture, incident management, change enablement, knowledge management, service level management, supplier management, and many others. Practices bring together people, information, technology, partners, and processes to support work in a structured and repeatable way. They do not define the organization's overall purpose, and they do not force a fixed order of execution. Instead, they supply the organizational capability that allows value chain activities to function and connect effectively within the broader value system.