Who was a major rockabilly artist?

Who painted the mural The History of Mexico in the National Palace in Mexico City?

A) ?Frida Kahlo B) ?Diego Rivera C) ?Pablo Picasso D) ?David Alfaro Siqueiros

What did the masons include at Durham Cathedral that would later become a hallmark of Gothic architecture?

A. ribbed groin vaulting B. a westwork C. chevron ornamentation D. two-story elevation