Agile methods in science engineering take which of the following approaches towards creating solutions?

A. Create multiple hypotheses about why a phenomenon is occurring and conduct research on all the possible outcomes.
B. Carefully generate several solutions and build them to test all at the same time.
C. Focus on more than one problem at a time so the project team can spread out their resources.
D. Quickly generate and implement solutions to assess the fit of the solutions to the problem.