d) In January 1937 the Spanish Republican government commissioned Pablo Picasso to create a mural on the theme of "technology" for the Spanish Pavilion at the 1937 World's Fair in Paris.
c) Picasso was living in Paris at the time and hadn't been to Spain for three years.
a) He still had connections to Spain as Honorary Director-in-Exile of the Prado Museum in Madrid, however, and so agreed to the commission.
b) On the first of May Picasso read George Steer's moving eyewitness account of the bombing of Guernica and started sketches for what would become the world-famous painting, known as Guernica.