Please go to the Question #1 post if you haven't had a chance work on this one yet, since the text below contains the solution.
The challenge in this question is largely that the words on the list aren't very common. Most people would probably know that an "ampersand" is the symbol used to signify "and" -- &. Of the other words, perhaps "umlaut" is the next most likely to be known, particularly by fans of Mötley Crüe. (The little dots above the o and u are umlauts. Who knows why these are so popular with heavy metal bands.)
The macron is similar, but it is a solid bar, indicating that the vowel over which it sits should be long (e.g. Māori). And the cedilla is a little curl that you would most likely find under the letter c (comme ça).
So three of the four words are symbols which alter the pronunciation of letters -- diacritical marks. That leaves ampersand as the correct answer. It is not like the others.