The writer is considering adding the following sentence after sentence 6.
Based on movement tracking, the devices can estimate how long someone is asleep and how often the person wakes up during the night.

Should the writer add this sentence?

A
Yes, because it provides commentary that helps explain why the details presented in sentence 6 are important to the point the writer is making in the paragraph.

B
Yes, because it indicates a shift from the discussion of the benefits of fitness trackers to a recognition that trackers are not perfect.

C
Yes, because explains the specific effects that result from the cause presented in sentence 6.

D
No, because it introduces new evidence without explaining how that evidence affects the central argument.

E
No, because it presents evidence that contradicts the claim the writer made in sentence 6.