Some food historians conclude that recipes compiled by an ancient Roman named Apicius are a reliable indicator of how wealthy Romans prepared and spiced their food.
Conclusion
It's hasty logic to conclude that the recipes compiled by Apicius are a reliable indicator of how wealthy Romans prepared / spiced food.
Evidence
We don't have other recipes from the same time period to compare these to, and Apicius may have been a weirdo chef, who was atypical from the rest (just as many famous modern chefs are).
Evaluate
The author is saying that it's hasty to use Apicius's recipes as a reliable indicator because we don't know whether he's a representative (typical) chef from then or not.
If we were trying to characterize the author's two pieces of evidence, it might sound something like this: - "few other recipes have survived" (the author indicates a sample might not be reliable because it can't be cross-referenced with other samples)
- (the author appeals to an analogy / a modern comparison)
Goal
Just find an answer choice that descriptively matches the argument.