Final answer:
The fibula is the bone among the options provided that is part of the appendicular skeleton, which includes the bones of the limbs and the girdles that connect these limbs to the axial skeleton. The other options, mandible, sternum, and sacrum, are all parts of the axial skeleton.
Step-by-step explanation:
The question is asking which of the following bones is part of the appendicular skeleton: mandible, sternum, fibula, or sacrum. The appendicular skeleton consists of all the bones that form the upper and lower limbs, and the girdles that connect the limbs to the central part of the skeleton (the axial skeleton). The fibula is one of the bones of the lower limbs and is therefore part of the appendicular skeleton. The mandible, sternum, and sacrum are part of the axial skeleton, not the appendicular skeleton.
The correct answer is c. fibula, as it is a bone in the lower limb and therefore included in the appendicular skeleton. The sternum and the sacrum are parts of the axial skeleton, while the mandible is part of the skull, which is also considered part of the axial skeleton.