The process of using wood to create mosaic images, as used in the design by francesco di giorgio martini to decorate a private studio for the duke of urbino around 1480, is called

The correct answer is intarsia.
It refers to the process where different types and colors of wood are inlaid on top of each other in order to create images and patterns similar to those of mosaics. Embroidery, weaving, and typography have to do with either cloth or paper, and repousse with metal, so only intarsia has to do with wood.

Iwould say d) signed unknown street singers who brought original songs to record.