June is developing new strains of horticultural plants, and she wants to check the chromosome numbers of her specimens. What would be the chromosome composition of the petal, pollen, and megaspore?
A. Diploid, diploid, triploid.
B. Haploid, haploid, diploid.
C. Haploid, diploid, haploid.
D. Diploid, haploid, diploid.
E. Diploid, haploid, haploid.