The correct answer is option 3: Carrot is orange in colour because it contains carotene. Carotene is a pigment that is responsible for the orange color in many fruits and vegetables, including carrots. It is a type of carotenoid, which is a group of plant pigments that give color to various fruits and vegetables. When we consume carrots, the body converts the carotene into vitamin A, which is essential for vision, immune function, and cell growth. However, it is important to note that not all carrots are orange in color. There are also purple, white, and yellow varieties of carrots, which contain different pigments. So, while option 3 is correct, it is also important to keep in mind that the color of a carrot can vary.