The transition word which is not correctly used in the passage is moreover.
As you can see in this sentence (<span>Moreover the invention of television and digital media, such as the Internet, most ads appeared in newspapers, magazines, and the radio.), something is wrong - the sentence doesn't sound natural or grammatical. This is why that word is the one which is used incorrectly, whereas the other sentences are good.</span>
I believe it is A. Because it’s talking about how the salt is a danger and letter A talks about the danger of it.
Hyphen's will be used when a word is hyphenated. Hyphens join words together, while dashes separate them.
One theme I can find is:
The way you dress yourself influences how you feel about yourself.
