以下不属于不良坐姿的是?(Which of the following is not a unhealthy sitting posture?)
A.
蹲在凳子上用电脑 ( Crouching on a stool to use a computer)
B.
趴在桌子上写作业 ( Lying on the desk and writing homework)
C.
低头弯腰用电脑 ( Bending down to use a computer)
D.
使用电脑时屏幕与眼睛同一水平 ( When using the computer, the screen should be at the same level as the eyes)