Daubert ruiling, is a rule of evidence regarding the admissibility of expert witnesses' testimony. The expert in your scenario is not a witness.
Miranda Rights, is the right that you have to remain silent. Anything you say can and will be used against you in a court of law. You have the right to an attorney.
Ballistics rule, has to do with the calculations of the optimum rate of twist for a given bullet.
A. Frye standard is the general acceptance test is a test to determine the admissibility of scientific evidence.
Update: B. Is the answer!
Answer: Carbon 12 and Carbon 13
In plant, the ratio of carbon 12 and carbon 13 isotopes is different depending upon the plant photosynthesis. The distribution of these isotopes in plant tissue can indicate the path way of carbon metabolism that is either C3 fixation or C4 fixation. This help scientist to know if the plant consumed by organism is C3 plant or C4 plant by measuring the isotopic signature of their collagen and other tissues.
This can help scientist know which plant is consumed by animals.