The Scrum Team consists of three roles: the Scrum Master, who coaches and facilitates the team; the Product Owner, who manages and prioritizes the Product Backlog; and the Development Team, who delivers a potentially releasable Increment at the end of each Sprint. A project manager is not part of the Scrum Team, as Scrum does not recognize titles or sub-teams. None of the above is also not a correct answer, as it implies that there is no Scrum Team at all.

The Product Owner is responsible for engaging the stakeholders, as stated in the Scrum Guide1: "The Product Owner is one person, not a committee. The Product Owner may represent the desires of a committee in the Product Backlog, but those wanting to change a Product Backlog item's priority must address the Product Owner."

The correct answer is C, because when a Development Team is having trouble delivering a working Increment because they don't understand a functional requirement, they should collaborate with the Product Owner to determine what is possible and acceptable. The Scrum Guide states that "the Product Owner is responsible for maximizing the value of the product resulting from work of the Development Team. How this is done may vary widely across organizations, Scrum Teams, and individuals." Therefore, the Product Owner should clarify the functional requirement and negotiate the scope of work with the Development Team.

According to the Scrum Guide1, an Increment is a concrete stepping stone toward the Product Goal. Each Increment is additive to all prior Increments and thoroughly verified, ensuring that all Increments work together. In order to provide value, an Increment must be usable. Multiple Increments may be created within a Sprint. The sum of the Increments is presented at the Sprint Review thus supporting empiricism. However, an Increment may be delivered to stakeholders prior to the end of the Sprint. The Sprint Review should never be considered a gate to releasing value. Therefore, implementation of a Product Backlog item is considered complete when the item has no work remaining in order to be potentially released.

According to the Scrum Guide, the best approach for Scrum Teams in order to produce valuable Increments is to have each Developer work on the component where they feel that they can contribute. This means that the Developers can self-organize and collaborate effectively to deliver a valuable Increment that meets the Definition of Done and the Sprint Goal. The other options are not valid approaches, as they either imply that the Developers work in silos or rely on external people (such as developing functionality from beginning to end, working on an independent set of components, or working only as an independent layer of the system).