All the above options are seemed to be part of quantitative analysis of food. So option D is more correct.

All the options are correct. 

All the options are correct.

All of the above is the answer for the following question because for quality analysis, those Al tests are required.

Currently, the most common technique for analyzing the food and feed samples is the polymerase chain reaction (PCR) . When quantitative analysis is required, the use of real-time quantitative PCR (qPCR) is preferred because of its accuracy and precision.

As per my knowledge I think that fluorimetric technique is used for the quantitative analysis of food.

As far as I know about the quantitative analysis of food Fluorimetric technique is used because it is a spectroscopic phenomenon which helps us in analysis at atomic level...
Hope this might be of some help...