You know an economist has crossed the line from scientist to policy adviser when he or she Group of answer choices
a. makes normative statements.
b. claims that the problem at hand is widely misunderstood by non-economists.
c. talks about the evidence.
d. makes a claim about how the world is.

a. makes normative statements.

Explanation:

In Economics there are two type of statements: positive statements and normative statements.

Positive statements describe an aspect of reality, while normative statements try to establish what ought to be about an aspect of reality.

For example, a positive statement is: the inflation rate is 4%.

While a normative statement is: the inflation rate should be between 3% and 4%.

When an economist uses normative statements, he is not only a scientist, but a policy adiviser as well, because he is using his knowledge to recommend actions that affect society, and that are political.

b is the correct answer