Grammar, Spelling, Punctuation, and Capitalization! Hope this helps :)
Answer:
Was
Explanation:
A linking verb is a type of verb that identifies a subject in a sentence and connects it to an adjective or noun.
Furthermore, unlike other types of verbs, they do not describe any direct action taken.
Therefore, the linking verb in "New Orleans cornetist Charles Bolden was a pioneer in the world of jazz music, according to many music historians." is WAS
Their is your answer the term her would not make any sense in this sentence but their would because asking did either of the sisters bring their umbrella and the term their belongs to both of the sisters
Move the passive sentence's subject into the active sentence's direct object slot.