The material that is brittle among the options provided is ceramic.
1. Explanation:
- Brittle materials are those that tend to break or shatter easily under stress without significant deformation.
- Ceramic materials are known for their brittleness due to the way their atoms are arranged, making them prone to fracturing when subjected to force.
2. Example:
- If you drop a ceramic plate on the floor, it is more likely to break into pieces compared to a plastic plate, wood, or metal, which may just dent or bend.
In summary, among the materials listed, ceramics are considered brittle because they break easily under stress without deforming.