Answer: (B) Design optimization
Step-by-step explanation:
The design optimization is the process of the design methodology in which we using the various types of optimal design for solving the designing related problems and issues in the system.
According to the given situation, the design optimization is one of the type of activity for designing the six sigma and it basically helps in achieving the high reliability and also ensure all the design are easily assembled and manufactured properly.
Therefore, Option (B) is correct.