Arthritis and other similar diseases can cause a narrowing of the spinal foramen. The images below show a healthy spine and a spine with a narrow foramen. Which symptom would an individual with a narrow foramen most likely experience?

A.
poor posture from loss of tendon attachment sites
B.
lower blood pressure from increased blood flow
C.
increased flexibility from the constriction of muscle
D.
back pain from the compressed nerves

The direction a chemical reaction occurs is represented by an arrow 

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