Answer:
C. Both a & b.
Explanation:
Pitch is how high and low the music is, and a steady beat, is steady. Rhythm you can clap with your hands, and uses many different eigth notes, quarter notes, half notes, and whole notes.
Hope this helps!
Answer:
Shift from optical-art to construct-painting
Explanation:
The shift from painting "what one sees" to a painting of "what one thinks about what one sees" describes shift from optical-art to construct-painting.