Correct Answer: Pachytene

Solution : The correct option is Pachytene.

Crossing over, also known as genetic recombination, occurs during meiosis I's pachytene stage. Pachytene is a critical stage in which homologous chromosomes couple up and exchange genetic material via crossing over. By generating novel combinations of alleles on the chromatids of homologous chromosomes, this exchange of genetic material adds to genetic diversity among children.