What is the clinical sign known as Schaeffer's sign characterized by?

A. Extension of the toes in response to squeezing the quadriceps tendon
B. Flexion of the toes in response to squeezing the Achilles tendon
C. Extension of the toes in response to squeezing the Achilles tendon
D. Flexion of the toes in response to squeezing the patellar tendon
Answer: 