Answer:
C. two chemical additives that sound very scary
Explanation:
The very purpose of articles such is this one (or any other text, that is) is telling something, conveying a message in a clear, concise manner, without irrelevant information.
Fluff, in writing, is ecatly that; artificial adding of irrelevant information, exaggerated use of description or excessive abuse of metaphors and other literary devices, usually with the purpose to make the text longer.
Although this passage is rather short, still there is an unnecessary excerpt "two chemical additives that sound very scary".
Other answers fit into this article, which is about unhealthy diet, a very important topic, and its consequences, some of which potentially lethal.
Answer C. is simply redundant to the rest of the text.
