During an iteration, the product owner insists that a feature must have a response-time threshold. The team explain that this requirement presents technical challenges, but does not jeopardize the iteration’s goal. What should the product owner do?
选项：

A:Urge the team to work overtime to satisfy this requirement.
B:Cancel the iteration if the team cannot satisfy this requirement.
C:Ask the team to prolong the iteration to satisfy this requirement.
D:Add a new user story to the backlog to satisfy this requirement.