Final answer:
Telophase is essentially the reverse of prophase, with the formation of the nuclear envelope, decondensing of chromosomes and disassembly of spindle fibers. Option C is correct option among the given options.
Step-by-step explanation:
The phase of mitosis that is essentially the reverse of prophase in terms of nuclear changes is Telophase (option C). In prophase, the nuclear envelope breaks down and the chromatin condenses into visible chromosomes.
However, in telophase, the nuclear envelope reforms and the chromosomes decondense back into chromatin. Additionally, the spindle fibers disassemble in telophase, which is another reversal of the changes that occur in prophase.
So Option C is correct option among the given options.