Bamboo is classified as option 2, which is "Grass." Although it may resemble a tree due to its height and woody stems, bamboo is actually a type of grass. It belongs to the family Poaceae, commonly known as the grass family. One of the key characteristics that define bamboo as a grass is the presence of hollow stems, called culms, which are made up of individual segments. Another identifying feature of bamboo is its rapid growth rate, which is typical of many grass species. Bamboo is known for its versatility and has various uses, from construction and crafts to culinary purposes. It is important to note that while bamboo falls under the category of grass, not all grasses are bamboo.