An enabling value stream contributes to value creation by supporting the operation and performance of core value streams. That is why option A is correct. Core value streams directly create or deliver value for service consumers, while enabling value streams provide the capabilities, resources, coordination, or support needed for those core streams to function effectively. Examples may include procurement, onboarding, internal platform management, or knowledge management processes that do not directly serve the customer at the final interaction point but are essential for smooth service creation and delivery. ITIL takes a holistic view of value creation and recognizes that many important workflows are indirect. These supporting streams do not replace core value streams, but they strengthen them by improving reliability, speed, quality, and consistency across the wider operating model.