Final answer:
The calcaneus bone is usually attached distally during the recovery of an Achilles tendon (option a).
Step-by-step explanation:
When recovering an Achilles tendon, a segment of the calcaneus bone is usually attached distally. The Achilles tendon of the posterior leg serves to attach plantaris, gastrocnemius, and soleus muscles to the calcaneus bone. This strong tendon is crucial for walking, running, and jumping as it connects the calf muscles to the heel bone, facilitating movement of the foot and ankle.
Hence, the answer is option a.