The correct answer is D. Clay.
Clay is a fine-grained, earthy material that forms from the weathering of rocks and minerals. It is composed of hydrated aluminum silicates, and it is plastic when wet. This means that it can be molded and shaped into different forms. Clay is used to make pottery, bricks, and other objects.
Quartz is a hard, non-metallic mineral that is found in rocks and sand. It is composed of silicon dioxide, and it is not plastic. Mica is a mineral that is composed of potassium, aluminum, silicon, and oxygen. It is a sheet-like mineral that is often used in electrical insulation. Granite is an igneous rock that is composed of quartz, feldspar, and mica. It is a hard, durable rock that is often used in construction.
In conclusion, clay is the only substance that is highly plastic. The other options are not plastic.