Option B.
Non-functional requirements, such as response time, should be communicated to the development team and included in the acceptance criteria for the user story. This ensures that the team is aware of the requirement and works towards meeting it during development.
While creating a comprehensive user story with all non-functional requirements (option A) and adding non-functional requirements to the definition of done (option C) are important, they do not necessarily address the issue at hand, which is the team's lack of awareness of the specific non-functional requirement.
A team review of the scope of work (option D) may also be beneficial, but it is not directly related to the issue of non-functional requirements being communicated to the team.