Identify the bones labeled $A, B, C,$ and $D$ in the given diagram of the human pectoral girdle and arm:

• A
  $A \rightarrow$ Scapula,$B \rightarrow$ Clavicle,$C \rightarrow$ Radius,$D \rightarrow$ Ulna
• B
  $A \rightarrow$ Clavicle,$B \rightarrow$ Scapula,$C \rightarrow$ Radius,$D \rightarrow$ Ulna
• C
  $A \rightarrow$ Coxal bone,$B \rightarrow$ Sacrum,$C \rightarrow$ Ulna,$D \rightarrow$ Radius
• D
  $A \rightarrow$ Clavicle,$B \rightarrow$ Scapula,$C \rightarrow$ Ulna,$D \rightarrow$ Radius