Shown below are the key frames of a character lifting a sack. Which option will replace the question mark? 
A
B
C
D
The full action runs from the character bending down to grab the sack, through crouching and holding it at the chest, all the way up to standing tall with the sack lifted overhead. A believable animation keeps the spacing between key poses roughly even, so the missing frame should sit at the halfway point between the chest-height pose just before it and the overhead pose just after it, not repeat an earlier pose or jump ahead too far.
Only option A keeps the lift moving at a steady, even pace between the chest-height pose and the overhead pose.
So the correct answer is Option A.








