Which step of the process of amphimixis produces new chromosomal variants?

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Recombination, also known as crossing over, is the step of the process of amphimixis in which new chromosomal variants are produced. During recombination, sections of homologous chromosomes are exchanged, creating chromosomes with unique combinations of genetic information. Gamete fusion (A) combines the genetic information from two gametes, but does not produce new chromosomal variants. Gamete production (B) and meiosis (D) are necessary steps for amphimixis to occur, but do not directly produce new chromosomal variants.

Which Step of the Process of Amphimixis Produces New Chromosomal