To answer this question, you need to understand the concept of XHTML.
XHTML stands for eXtensible Hypertext Markup Language.
Option A) eXtra Hypertext Markup Language - This option is incorrect because the correct expansion of XHTML is "eXtensible" and not "eXtra".
Option B) eXtension Hypertext Markup Language - This option is incorrect because the correct expansion of XHTML is "eXtensible" and not "eXtension".
Option C) eXtensible Hypertext Markup Language - This option is correct. XHTML is a stricter and more structured version of HTML that follows the XML syntax and allows for greater interoperability between different web browsers and platforms.
Option D) eXtended Hypertext Markup Language - This option is incorrect because the correct expansion of XHTML is "eXtensible" and not "eXtended".
The correct answer is C) eXtensible Hypertext Markup Language. This option is correct because it accurately represents the expansion of XHTML.