Which of the following sentences uses slang?
a. they do not tend to be late.
b. they are absolutely never late.
c. y’all don’t be late.
d. they did not mention they would be late.

The correct answer is: C: Y'all don't be late. This is slang because word "You" is shortened to "Y", so instead of "You all", there is just: "Y'all". By definition, slang consists of a lexicon of non-standard words and phrases in some language. Use of these words and phrases is typically associated with the subversion of a standard variety (for example: standard English) and is likely to be interpreted by listeners as implying particular attitudes on the part of the speaker. In some contexts a speaker's selection of slang words or phrases may convey prestige, indicating group membership or distinguishing group members from those who are not a part of the group.

Where is the underlined word