The correct answer is B.
“Who has time,” you might say, “to determine if each problem is really solved?” One could respond with, “Who has time not to do this? Who has time to deal with the same problem twice?” The final steps of problem solving include: implement a decision, review it, and confirm that the decision solved the problem.
Pass PMP in the First Attempt : PMP Strategy
Revise PMP Concepts: PMP Concepts
Quiz:
20 Questions Challenge
50 Questions Challenge