Select the correct usage of in-text citation in APA style.

	a.	American's attitudes toward wilderness, like the wild lands themselves, are constantly changing (Nash 2014).
	b.	American's attitudes toward wilderness, like the wild lands themselves, are constantly changing (Roderick Nash).
	c.	American's attitudes toward wilderness, like the wild lands themselves, are constantly changing (Nash, 2014).
	d.	American's attitudes toward wilderness, like the wild lands themselves, are constantly changing (Nash).