Each Group of Sentences Below Could Be Organized into and Written

Each group of sentences below could be organized into and written as a paragraph. In each group, select the letter of the topic sentence. Which sentence is the topic sentence?

A) The announcer introduced us as the "Huge Notes" instead of the "High Tones."
B) All the lights in the theater flashed on and off throughout our last song.
C) Starting our first song a half-beat too late, Dina threw the rhythm off for the rest of us.
D) The debut of our singing group at the college talent show last Saturday was a total disaster.
E) Halfway through our act, our lead singer's microphone went dead for three minutes.
F) Calvin arrived so hoarse that he could hardly sing at all.