When many Scrum Teams are working on the same product, should all of their increments...

The correct answer is B, because the Scrum Guide states that “at the end of a Sprint, the new Increment must be ‘Done,’ which means it must be in useable condition and meet the Scrum Team’s definition of ‘Done’. An increment is a body of inspectable, done work that supports empiricism at the end of the Sprint. The increment is a step toward a vision or goal.” Therefore, all the increments from different Scrum Teams working on the same product should be integrated every Sprint to enable inspection and adaptation by the Product Owner and stakeholders.