Which sentence from the Introduction suggests that scientists and video game companies rarely work together on research?

A. Oxford University researchers conducted a study on how playing video games affects the mental health of game players.

B For a long time, scientists have been hoping to better understand how playing video games impact people.

C They wanted to understand the effects of video games on behavior and the feeling of well-being.

D However, a lack of transparency from game makers has been a challenge.​