A quality analyst is asked to measure the various parameters such as number of defects, the amount of work performed in a day, the defects?

The answer is:

B. Defect Density

Defect density. Thanks for the invitation.

Defect density is the technical term for the subject question and an apt answer

I go for 

B.  Defect Density

Defect Density is the correct answer.

Quality of Metrics should measure the performance of the work

I leave the answer to experts and specialists in this area this is not my specialty field

Agree with your answer,

B. is my option....

Thanks

B.  Defect Density is the most suitable answer