Which of the Following Is Most Accurate

Which of the following is most accurate?

A) The uniqueness of every problem situation precludes applying research designs.
B) Though every problem is unique there are enough similarities among problems and objectives to allow us to make some advance decisions about the best plan to use to resolve the problem.
C) Every problem is so unique there are not enough similarities among problems and objectives to allow us to make any advance decisions about the best plan to use to resolve the problem.
D) Since research standards are standard, actions determining the research design may be pre-planned.
E) none of the above are accurate