Accepted Answer
The stricture responsible for organizing spindle fibers during mitosis is the centriole. The third option.What is mitosis?Mitosis refers to the division of non-sex or vegetative cells in the body of living organisms to produce two daughter cells. The onset of mitosis is marked by the dissolution of the nuclear membrane and the condensation of the chromatin material located in the nucleus. Thus, the chromatin material becomes visible as chromosomes.Simultaneously, the centrioles start giving off spindle fibers at the opposite ends of the cell. This stage of mitosis is referred to as prophase.Thereafter, the chromosomes align at the center of the cell and the spindle fibers from the centriole engage each chromosome at the centromere. This stage is otherwise known as metaphase.Next, the spindle fibers start shortening to pull apart sister chromatids to opposite poles. This is the anaphase.The sister chromatids complete their migrations to the pole at telophase. Thereafter, the nuclear membrane reappears, the chromosome decondense, and the cytoplasm divide to give two independent daughter cells.In other words, the structure responsible for organizing spindle fibers is the centrioles.More on mitosis can be found here: https://brainly.com/question/26678449#SPJ1