You have identified the project's requirements and criteria, as well as the difficulty. The next step in the process should be to begin testing different prototypes to see how well they solve the problem. The correct option is b.
A project is well organized and planned thing to achieve an aim. A scientific project is when a scientific thing is unraveling, Here the project is space exploration. Here the problem is detected, so solving the problem would be the next step.
Thus, the correct option is b. Begin testing different prototypes to see how well they solve the problem.
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