Answer:
Rearfoot motion.
Explanation:
Rearfoot motion includes the assessment of subtalar joint by using the instrument called goniometer. Rearfoot motion describes the motion of posterior region of the foot.
Rearfoot motion includes the natural squential pattern of supination and pronation during the running stance phase. The rearfoot motion is measured for clinical and research purpose in the angle between lower leg and shoe.
Thus, the correct answer is option (A).