Answer:
c. the brightness or dullness of a color.
Explanation:
I do believe it’s “A”, this is because she has a great description of what the piece is, but she doesn’t know what she likes or dislikes about it ( I am sorry if this doesn’t help, I have only just begun Brainly a month or so ago)
The answer should be "etching"
The exposition in sonata-allegro form is an optional ending in the tonic key.