If You Attempted to Evaluate the Different Economic Models in Order

If you attempted to evaluate the different economic models in order to discover which type is the best, you would soon discover that your job is extremely difficult because:

A) social democracies are new, providing little data to evaluate.
B) socialist economic systems have been tainted by communism.
C) all countries mix capitalism and socialism to varying degrees.
D) you're trying to compare apples to oranges-it simply cannot be done.
E) people are inherently biased in their evaluations.