How are bird and human forelimbs different

Birds have hollow bones

The birds forelimbs are wings and must have a strong support system. The collarbone of the bird is fused to form the furculum , or wishbone. The shoulderblade of the human is actually a bone called the scapula , birds have a scapula and they also have an additional shoulder blade bone called the corocoid.

I hope this helps

Answer should be b : ))