A synonym is a word that has the same meaning as another, like "to end" and "to finish".
These are very useful when you write a text and want to avoid repeating the same word over and over. Just have to be careful though, because synonyms have the same general meaning... but each word has a specific meaning, that's why it was created in the first place.
<u>Option B</u>, a word that has the opposite meaning as another,<u> is an antonym,</u> not a synonym.
Normally its the pleasure of doing so or they are just in need of something (i.e. robbing a bank-in need of money). Most people who do something wrong to get something they want do it for the thrill or the pleasure.
