(C) The endosperm of a seed is triploid $(3n)$,therefore $3n = 21$.This implies that the haploid number $(n)$ is $21 / 3 = 7$.The secondary nucleus (o

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(C) The endosperm of a seed is triploid $(3n)$,therefore $3n = 21$.This implies that the haploid number $(n)$ is $21 / 3 = 7$.The secondary nucleus (or definitive nucleus) is diploid $(2n)$,formed by the fusion of two polar nuclei.Therefore,the chromosome number in the secondary nucleus is $2n = 2 \times 7 = 14$.