1-C. At the same time, challenging myself physically taught me that I had the ability to do more than I had thought.At the same time, challenging myself physically taught me that I had the ability to do more than I had thought.
2-C. Such singers are trained to present some of the greatest and most challenging music that has ever been composed for the human voice.Such singers are trained to present some of the greatest and most challenging music that has ever been composed for the human voice.
3-C. Conversely, those who believe that they can perform well are more likely to take on challenging tasks rather than avoid them.Conversely, those who believe that they can perform well are more likely to take on challenging tasks rather than avoid them.