The correct answer is: C. Chromatids
During the metaphase and anaphase stages of cell division, each chromosome comprises of two unseparated replicas known as the chromatids. These chromatids are connected by a centromere, which is a region of the chromosome that is essential for cell division. The chromatids are identical copies of each other, and they are separated during anaphase.
Chiasmata are the points of contact between two homologous chromosomes during meiosis. They are formed by the crossing over of genetic material between the two chromosomes.
Plastids are organelles found in plant cells. They are responsible for photosynthesis, which is the process by which plants convert sunlight into energy.
Tetrads are groups of four chromatids that are formed during meiosis. They are made up of two homologous chromosomes that have paired up.