Concept:
Different acting theorists have different views on "reality" on stage. Naturalism seeks to create an illusion of reality, while other forms like Biomechanics seek a more stylized truth.
Step 1: Evaluating the definition of Acting.
Assertion (A) is a general and widely accepted definition of realistic acting—creating the "illusion of reality" for the audience.
Step 2: Evaluating the source of the concept.
Reason (R) is incorrect. Vsevolod Meyerhold (spelled Mayorhold here) was famous for Biomechanics, which was a reaction *against* the illusion of reality. He wanted the audience to be aware they were watching a performance, not a "slice of life." The "illusion of reality" is more closely associated with Stanislavski.