AHair
BLeaf
COnion root
DFlower bud
Answer:
D. Flower bud
Read Explanation:
Diakinesis is a phase of Meiosis.
Meiosis is the reductional division in which four cells are formed from one cell and the chromosome number of each cell is halved of the original.
Moreover, the meiosis was first observed by Moore and Farmer.
Meiosis occurs in only the reproductive parts of the organisms.
The flower bud is the reproductive part of the plant.
These cells divide with the help of the meiotic division.
This is because the cells of the reproductive parts of the plant divide with the help of meiosis but the vegetative parts of the plant do not divide with the help of meiotic divisions.
Thus, based on the above information we can conclude that the diakinesis can be observed best in the flower bud.