Final answer:
Quick Send reduces the time required to set up marketing journeys by allowing swift message delivery without constructing a full journey infrastructure.
Step-by-step explanation:
The benefit of Quick Send to Journeys is B) Reduces the time required to set up journeys. Quick Send is a feature that allows marketers to swiftly send emails or other messages without having to construct the full journey infrastructure, which often includes triggers, conditions, and actions. This functionality is particularly valuable when there is a need to respond rapidly to market changes or to communicate a message to a subset of users without the overhead of a full journey setup.