Answer: A. Explain the main goal of believable SFX makeup
Explanation: The first sentence sums up the purpose of this article, "SFX makeup artists must apply their skills in a way that appears believable to viewers." The subsequent parts of the passage are simply giving an example of SFX makeup in regards to monstrous creatures in order to show the reader that this main idea the author is trying to convey applies to all kinds of SFX makeup.