The pose is when the character's cog is at its lowest point and the character is leaning fully into the forward walk motion.

high-point

contact

recoil

passing

Recoil pose

This frame is where the character fully impacts the ground and is at its lowest point in the cycle when it is leaning fully into the forward walk motion. The arms of the character are a bit further from the body and the front foot is fully in contact with the ground. The rear foot, on the other hand has just lifted up from the ground.  

the answer is d. splog

whats