What is adobe?

Adobe is a building material made from earth and organic materials. It is primarily composed of clay, sand, and straw, which are mixed together and then formed into bricks that are left to dry in the sun. This technique has been used for centuries, particularly in dry regions where wood and other building materials are scarce. The sun-dried nature of adobe bricks makes them particularly sustainable and environmentally friendly, as they utilize natural resources readily available in many areas. This characteristic is what solidifies option A as the correct choice, as it directly describes what adobe is and its primary composition.