Your customer has sent complain about the quality of your last shipment as there were lot of defects. You need to find out the reasons for the defects. You will use:

Ishikawa diagram shows the causes of an event and is often used in manufacturing and product development to outline the different steps in a process, demonstrate where quality control issues might arise and determine which resources are required at specific times. 

So, my answer is:

A.  Ishikawa Diagram

My choice is

A.  Ishikawa Diagram.............

Ishikawa diagrams (also called fishbone diagrams, herringbone diagrams, cause-and-effect diagrams, or Fishikawa) are casual diagrams created by Kaoru Ishikawa () that show the causes of a specific event. Common uses of the Ishikawa diagram are product design and quality defect prevention to identify potential factors causing an overall effect. 

A.  Ishikawa Diagram............

Yes, Ishikawa or Cause and effect diagram used for analysing root cause.

Option A fish bone, cause and effect diagram 

A.  Ishikawa Diagram is the correct answer and fully agree with the eraliar answers of experts

A. Ishikawa DIagram

Thanks

thanks for invition ,,,,,,,,,, my choice is option A