The correct option is B Synapsis
A chiasma is a point, where two homologous non-sister chromatids exchange genetic material during chromosomal crossover during meiosis.
Crossing over is the exchange of genetic material between homologous chromosomes, which results in recombinant chromosomes.
Duplication is when a part of the chromosome is copied or duplicated abnormally, resulting in extra genetic material from the duplicated segment.
Synapsis is the pairing of two homologous chromosomes that occurs during meiosis.
So, the correct answer is option D.