Delete it, because it contradicts the information in sentence 12 about the cost of fitness trackers and the fact that many people cannot afford them. (The measurements are not exact, and) there is a strong benefit in that people who track their sleep are apt to be more mindful of sleep in general.
Which most effectively expresses the relationship between the ideas in the sentence above?

A. The measurements are not exact;
B. The measurements not being exact,
C. Because the measurements are not exact,
D. Even if the measurements are not exact,
E. The measurements are not exact; furthermore,