Serious, cynical, and even grim.
The correct answer is - it remains in one key area.
The entire movement is performed in G major, k. 453, whereas the symphony sonata-allegro varies the keys it is performed in. The name says 'allegro,' which means 'lively,' and is characterized by fast pace in music, and the use of numerous keys.
Correct answer: C. "By the dawn's."
This is the section from the opening phrase that has a rise in pitch, all the way up to an "e" and then down to an "E". Attached is a music scale so that you can see the notes I'm referring to. The difference is an octave.