What is the reason for inserting commas into this sentence?

[ Grammar ]

What is the reason for inserting commas into this sentence?
Harriet Tubman escaped along the Underground Railroad, a network of abolition supporters, and made her way toward freedom.

    A.     Commas in a series
    B.     Introductory commas
    C.     Commas of direct address
    D.     Appositive commas
    E.     Comma splice

Select your answer:
A B C D E

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