Which of the following code examples will validate as XHTML 1.0 Transitional?

You have been asked to insert an image named kayak.jpg in a Web page. Which of the following code examples will validate as XHTML 1.0 Transitional?

A.
<img src=kayak.jpg desc=kayak />

B.
<img src=kayak.jpg alt=kayak />

C.
<img src=kayak.jpg alt=kayak></img>

D.
<img ref=kayak.jpg desc=kayak></img>