Valerie is writing about how she feels technology has affected American culture.

Almost everyone considers high-speed Internet service to be an essential part of everyday life. The same can be said for high-definition TVs, digital cable and satellite, and DVDs. New entertainment devices are released every year. We have Blu-ray Discs, high-definition DVDs, game systems, and cell phones. We live in a culture that is focused on technology: who has it, who wants it, and how to get it. People should spend less time in front of their TVs and computers because their personal relationships may suffer, they can have health problems due to a lack of physical activity, and they need to unplug and relax.

Which of these sentences from the passage is Valerie's thesis?
A.
The same can be said for high-definition TVs, digital cable and satellite, and DVDs. New entertainment devices are released every year.
B.
People should spend less time in front of their TVs and computers because their personal relationships may suffer, they can have health problems due to a lack of physical activity, and they need to unplug and relax.
C.
We live in a culture that is focused on technology: who has it, who wants it, and how to get it.
D.
New entertainment devices are released every year.