Ulna is identified in picture below .
What is ulna bone ?
The ulna is one of two bones that make up the forearm, the other being the radius.
What is ulna function?
The ulna is located on the opposite side of the forearm from the thumb. Together with the radius, the ulna enables the wrist joint to rotate.
Hence, A is correct option
To learn more about ulna , here
https://brainly.com/question/13047292?referrer=searchResults
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