C. Before going on stage George felt ... 1) confident. 2) indifferent. 3) nervous, 4) angry.

Решение:

В тексте описываются чувства Джорджа перед выходом на сцену: "His heart raced, he imagined his name in bright lights, he felt he had to try, but felt those familiar butterflies fluttering in his stomach." Это указывает на волнение и нервозность.

Ответ: 3) nervous.