Final answer:
The major component of centromeric DNA is alpha satellite DNA, which plays a crucial role in chromosome segregation during cell division.
Step-by-step explanation:
The major component of centromeric DNA is (C) alpha satellite DNA. DNA condenses into chromosomes with two identical copies called sister chromatids connected at the centromere. The centromeric region is known to contain specific repetitive DNA sequences known as alpha satellite DNA. This DNA helps in the attachment of the sister chromatids and plays a significant role during cell division by aiding in the formation of the kinetochore, ensuring proper segregation of chromosomes.