Which one of the following diagrams shows the direction and duration of wind?

The correct answer is the Star diagram (often called a Wind Rose). This is a radial chart used in geography and meteorology to visualize wind patterns. It features spokes radiating from a center like a star. The direction of each spoke shows where the wind is coming from, and the length of the spoke represents the duration (or frequency) that the wind blows from that direction. In contrast, a Climogram shows temperature and rainfall, a Cartogram is a statistical map, and an Ergograph relates human activities to seasonal climate.