The commentator made several remarks about the breaking news that surprised the listeners. Commentator most nearly means:

correspondent

Explanation

An “orator” is a public speaker, a “passerby” is a person who happens to be going by, and an “onlooker” is a spectator. A “correspondent” is someone who is employed for a broadcasting organization, so this answer is the most likely given the context clues about breaking news and listeners.

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