Two centrioles are collectively called as
The correct option is A Diplosome
Diplotene is fourth phase of prophase of meiosis. At this phase, homologous chromosomes begins to separate and chiasmata (a point where two non-sister chromatids crossover) can be seen. Therefore, option B is incorrect.
Leptotene is first phase of prophase of meiosis. At this phase, chromosomal condensation starts and appears as threads. Hence, option C is incorrect.
Zygotene is second phase of prophase of meiosis. At this phase, the homologous chromosomes begin to unite by coming into approximate alignment. Hence, option D is incorrect.
Two centrioles arranged perpendicularly are called as diplosome. They are situated near the nucleus. Therefore, option A is correct.