This question requires the identification of haploid cell pairs. Haploid cells possess a single set of chromosomes. - The egg cell is haploid, containing half the chromosomal number needed for fertilization. - Antipodal cells, originating from the female gametophyte, are also haploid. Conversely: - The nucleus and polar nuclei are diploid, containing two sets of chromosomes. - The ovule's nucleus is also diploid. Consequently, option (C) is correct, as both the egg cell and antipodal cells are haploid.