Read the passage.

Excerpt from "Plays and Players"
Interview with Robert G. Ingersoll
New York Dramatic Mirror, December 26, 1891

Question: What place does the theatre hold among the arts?

Answer: Nearly all the arts unite in the theatre, and it is the result of the best, the highest, the most artistic, that man can do. In the first place, there must be the dramatic poet. Dramatic poetry is the subtlest, profoundest, the most intellectual, the most passionate and artistic of all. Then the stage must be prepared, and there is work for the architect, the painter and sculptor. Then the actors appear, and they must be gifted with imagination, with a high order of intelligence; they must have sympathies quick and deep, natures capable of the greatest emotion, dominated by passion. They must have impressive presence, and all that is manly should meet and unite in the actor; all that is womanly, tender, intense and admirable should be lavishly bestowed on the actress. In addition to all this, actors should have the art of being natural.

Read this sentence from the interview:
"Let me explain what I mean by being natural."

How does this sentence affect the tone of the interview?

A. It creates a formal and reliable tone.
B. It creates a formal and stern tone.
C. It creates an informal and familiar tone.
D. It creates an informal and ironic tone.