Inference from Passage

Based only on the following passage, which one of the options can be inferred with certainty? When the congregation sang together, Apenyo would also join, though her little screams were not quite audible because of the g...

The author said, "Musicians rehearse before their concerts. Actors rehearse their roles before the opening of a new play. On the other hand, I find it strange that many public speakers think they can just walk on to the...