I read a novel once where the main character showed the ignorance of a minor character because the latter was dense enough to use the last choice above as his password. D is really not the answer.
A has the same fault. Since we commonly use only 10 digits, putting them in order is just about as rich in laughs as D. So A is not the answer.
roger123 is the second best answer, but C is much better.
C is the best answer. That's going to be tough to break with so many choices of used for each blank.
Answer C <<<<<< answer.