Who painted the Maestà (or Virgin and Child), which once hung in the council chamber of Siena's Palazzo Pubblico?

This composition exploits to good purpose which of the following

a) a dense contrapuntal texture b) contrasting sonorities c) a stark overall texture that allows for lots of textual clarity d) virtuoso display

What area did the Ancestral Puebloans inhabit?

A) ?Canada B) ?the U.S. Southwest C) ?Brazil D) ?the U.S. Midwest