<em>Nonstandard English</em><em> is the option that describes the term "slang".</em>
Explanation:
<u>Slang</u> is a type of language that consists of words and phrases regarded as very informal, nonstandard register, usually restricted to a particular group of people. <u>Slang</u> is most commoly used in speech rather than in written language because is not part of standard vocabulary.