To any observer, the clock would appear to be on top of the door, although the 
OPTIONS:
- clock was actually lower, due to an optical illusion.
- door was actually lower, due to an optical illusion.
clock was actually lower, due to an optical illusion.

The man became healthy because of the elliptical machine, not the treadmill. The 
OPTIONS:
- elliptical machine is more to his fancy.
- treadmill is more to his fancy.
elliptical machine is more to his fancy.

Bad posture causes the shoulders to round and the hips to arch. The 
OPTIONS:
- shoulders do this because the thoracic spine is curved backward.
- hips do this because the thoracic spine is curved backward.
hips do this because the thoracic spine is curved backward.