The diagram below shows a diploid cell with two homologous pairs of chromosomes. Due to independent assortment and crossing-over, the possible allelic combinations that could be found in gametes by the meiotic division of this cell are _________________.
​
A
Bb, Dd, BB and DD
B
BD, bD, Bd and bd
C
BBDd and BDbd
D
Bd and bD only