It is common knowledge that actors are conceited because they have to be in order to be actors" is an example of what kind of fallacy?

- Circular reasoning.

Explanation:

A Fallacy is described as a flaw or error in the reasoning of an argument which makes the argument unsound and invalid.

Circular reasoning is characterized as the logical fallacy in which the argument begins with the point through which the author wishes to end/conclude the argument.

The given argument exemplifies 'circular reasoning' as it assumes that 'the actors are conceited' which implies that the point author is trying to prove is already assumed true. This creates a logical error as the conclusion is made without any proof.