To provide scientific evidence regarding the sugar content, including fructose, in peas, the student should use the Benedict's test. This test is commonly used to detect the presence of reducing sugars, including fructose.
The other tests mentioned serve different purposes:
- The brown paper bag test is for detecting lipids (fats).
- The iodine test is used to detect starch.
- The vinegar test does not directly relate to sugar content.
Therefore, the best choice for her argument concerning fructose would be the Benedict's test.