Once you see the pattern, the correct answer becomes screamingly obvious.
For now, I'd say D is the only correct answer.
Note that there is only one correct answer to each question.
There is a correct answer to this question, though.
The correct answer she was looking for is a giant ego.
He gave us the correct answer in many ways.
With every correct answer, victory was closing in on their quiz team.
It took hours to get at the correct answer to the puzzle.
After weeks of trial, her computation finally yielded the correct answer.
He finally arrived at the correct answer using the process of elimination.
If you sum these two values, you will get the correct answer.
She felt a rush of excitement as the buzzer announced her correct answer.
He took a moment to make a guess before checking the correct answer.