Which is the appositive in this sentence?

Though he is young, Nelson, an art historian, is widely admired for his knowledge of modern art.

A.
of modern art

B.
Though he is young

C.
an art historian

Question

Which is the appositive in this sentence? 

Though he is young, Nelson, an art historian, is widely admired for his knowledge of modern art.

 A.
of modern art
 
 B.
Though he is young
 
 C.
an art historian

anonymous · Answer

it would be C because an appositive phrase that renames the noun beside it