A 35-year-old mechanic complains of low back pain which started when he lifted a barrel of hay. The pain is better when he lies on his stomach with ice on his back. The pain radiates to the dorsum of the left foot. There is decreased sensation over the dorsum of the left foot and the Bechterew's test is positive.*

Which structures are likely to be affected?

A. L4/L5 disc

B. L5/S1 disc

C. Atrophy of the gastrocnemius muscle

D. Hypertrophy of the soleus muscle

E. L5 nerve root

F. S1 nerve root

G. Weak toe flexion

H. L3 nerve root

I. Weak big toe extension