They are all a type of irony
The answer to your question is :
The cat is grey.
I would say the first one! Good luck!
C)I am hoping that this University will see to it that the youths who come to it will receive their instruction through the medium of their vernaculars.
The D-Day invasion was perhaps the most single important event of WWII because it put Allied troops in Europe and contrained German forces between France and Russia effectively leading to the end of the war.