To solve this problem, we need to determine where spindle fibers attach during cell division. Let's analyze each option:$\newline \bullet$Option 1: Telomere of the chromosome.$\newline$ - Telomeres are the protective caps at the ends of chromosomes.$\newline$ - Spindle fibers do not attach to telomeres.$\newline \bullet$Option 2: Kinetochore of the chromosome.$\newline$ - The kinetochore is a protein structure on the chromosome where spindle fibers attach during cell division.$\newline$ - This is the correct site for spindle fiber attachment.$\newline \bullet$Option 3: Centromere of the chromosome.$\newline$ - The centromere is the region of the chromosome where the kinetochore forms.$\newline$ - While the centromere is crucial for attachment, it is the kinetochore that directly binds to spindle fibers.$\newline \bullet$Option 4: Kinetosome of the chromosome.$\newline$ - Kinetosome is not related to chromosomes; it is associated with the basal body of cilia and flagella.$\newline$ - Spindle fibers do not attach here.$\newline$Therefore, the correct answer is Option 2: Kinetochore of the chromosome.