Final answer:
The exchange of genetic information between homologous DNA molecules during meiosis is called crossing-over, and it is essential for increasing genetic diversity.
Step-by-step explanation:
Recombination is the exchange of genetic information between DNA molecules and when it occurs between homologous DNA molecules, the process is known as crossing-over. Crossing-over happens during prophase I of meiosis and involves the exchange of genetic material between non-sister chromatids of homologous chromosomes. This is an essential mechanism for increasing genetic diversity as it leads to the production of recombinant chromosomes that have a mix of parental genes. Therefore, the correct answer is D) Crossing-over.