In this paragraph what is the authors explicit message about his inspiration for merlin’s voice

I believe that the explicit message is that the author’s inspiration for Merlin’s voice was the owl outside his window.

In the excerpt from the article "Vision, Voice and the Power of Creation: An Author Speaks Out," T. A. Barron states that he had difficult time finding the right voice, but at the end, the inspiration was the sound of an owl outside his window: “I finally heard the voice of Merlin thanks to a surprising source: the haunting, mysterious hooting of a great horned owl outside the window of my Colorado home.”

The sentence that is punctuated incorrectly is option D) "The main purpose of parkour is to keep moving forward by combining various movements, (such as the roll, cat leap, precision jump, kong vault, and speed vault)—in a fluid fashion."

The mistake in the sentence is the use of parenthesis after a comma. Another mistake is that after closing a parenthesis, no em dash should be placed.

According to punctuation rules, you can use commas, parenthesis or em dashes to emphasize ideas in a text but you cannot mix those punctuation marks within the same sentence as in this example.

Options A, B and C use punctuation rules correctly.