The correct option is A It involves two cycles of DNA replication, one before meiosis-I and another before meiosis-II
Meiosis is a type of reductional division in which the parent cell divides to form four daughter cells. Meiosis involves two sequential cycles of nuclear and cell divisions called meiosis-I and meiosis-II.
Before the cell starts to divide (either by mitosis or meiosis), it undergoes a preparatory phase called interphase. Interphase includes G1, S and G2 phases. Cell undergoes DNA replication in the S phase of interphase. Due to DNA replication, the total content of DNA doubles in the cell. So, the DNA replicates before meiosis-I in interphase and no further DNA replication takes place later.
Crossing over is a significant event occurring during meiosis which is responsible for recombination.
The homologous chromosomes separate during anaphase-I and sister chromatids separate during meiosis-II.
The nuclear membrane disappears during prophase.