Answer;
C.) during prophase
Explanation;
-Prophase is the first phase of mitosis, the process of cell division in which a parent cell divides into two daughter cells that are similar to the parent cell, and is separated into four stages.
-During this phase of mitosis each chromosome becomes condensed and more visible, and there is the breakdown of the nuclear membrane and appearance of spindle fibers.
-Initially, prior to prophase, the chromosomes were long strands of DNA material called 'chromatin', which then curls up into tightly wound shapes called chromosomes.
