Which ancient Greek playwright wrote Agamemnon?

Which of the following is a true statement about this composition?

a) having established a strong sense of the tonic at the beginning of the movement, the composer moves away from it after the middle of the movement (to III and iv) and then returns to it at the end b) the work, while strong in melodic contrasts, features little meaningful harmonic variety c) it relies on the element of dance and is programmatic d) the work avoids the sequential repetition of ideas otherwise typical of its composer

The Great Mosque of Kairouan is known for its __________.

A. horseshoe arches B. central plan C. barrel vaults D. stained glass