Caitlyn grew up in the southern region of the United States. She often uses the word "y'all" to refer to both a single person or a group of people. Caitlyn's friend Max grew up elsewhere and thinks this language is strange. Where Max grew up, no one ever uses the word "y'all." The differences between Caitlyn's and Max's behavior and perceptions BEST demonstrate the concept that _____ can be complicated in determining what is normal and what is abnormal.

	a.	impairment in daily functioning
	b.	deviation from social norms
	c.	infrequency
	d.	personal distress