Which animation studio produced "Sword Art Online"?
Explanation
A-1 Pictures is the animation studio that produced Sword Art Online. The studio was chosen to bring the popular light novel series to life due to their expertise in creating visually stunning and immersive anime. Their reputation for delivering high-quality animation, along with their experience in producing other successful anime series, made them an ideal choice for bringing the unique world and characters of Sword Art Online to the screen.