Please answer this question fast please I request you

Dear Student,

It is the X-shaped structure called as Chiasmata, a point of interaction where broken chromatids of the two homologous chromosomes rejoined and starts pairing. During prophase of meiosis the two homologous chromosomes are seen to be joined at several points along their length. These points are called chiasmata (chiasma, a cross). Each chiasma is the site of an exchange between chromatids. It is produced by breakage and reunion between any two of the four strands present at each site. As a result, genes  from one chromosome may swap with the genes from other chromosome leading new gene combination in the resulting chromatids. 
Hence, the correct option is option B.

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