Question

select the appositive or appositive phrase.
in 1963, mahalia jackson, the queen of gospel, performed at the historic march on washington. she was a friend of martin luther king, jr.s, and she famously prompted him to tell the crowd about his dream.

Explanation:

An appositive renames or further identifies a noun. Here, "the Queen of Gospel" renames Mahalia Jackson.

Answer:

the Queen of Gospel