According to http://www.ucsusa.org/global_warming/science_and_impacts/science/ozone-hole-and-gw-faq.html#.WQjhDfW...
I think the answer is B.CFC
It has something to do with the combination of behavioral, biological, and cultural reason.
C.) increase the concentration of one of the solutions
Based on the scenario, the effect that it would has on the embryo would be :
Development of the nervous system is affected
Defect in neural tube can cause abnormalities in the spina
hope this helps