At metaphase, chromosomes are attached to the spindle fibres by their Centromere, Secondary constrictions, Satellites, or Kinetochores?

Spindle fibers are the threadlike structure that is made up of microtubules. These originate from the centrioles during cell division and helps in the movement of chromosomes towards the pole. During metaphase, each chromosome gets attached to two spindle fibers, one from each pole, in the region of its kinetochores. So, the correct answer is Kinetochores.