Your answer is "B"
The others are part of the story system, but they aren't what you're looking for.
Answer:
It was on Aug. 25, 1970 that John was first introduced to a U.S. audience at the Troubadour, a small but popular music venue in West Hollywood, Calif. Roughly 300 people were in attendance that evening, among them Quincy Jones, Gordon Lightfoot, David Crosby and the Beach Boys' Mike Love.