During the early stages of meiosis, two chromosomes in a homologous pair may exchange segments, producing genetic variation in sex cells. this process of exchange is called

crossing over.

Explanation:

When two chromosomes in a homologous pair exchange segments, producing genetic variation in sex cells the process is called crossing over.

where is the diagram?

if you insert the diagram ill be able to you

i am positive it is c. condensing but i may be wrong