Which line of code should you use?

You are developing an HTML5 web page. The appearance of the text box must change when a user moves the focus to another element on the page.
You need to develop the page to respond to user action.
Which line of code should you use?

A.
<input type=”text” onblur=”resetStyle(this);” />

B.
<input type=”text” onfocus=”resetStyle(this);” />

C.
<input type=”text” onreset=”resetStyle(this);” />

D.
<input type=”text” onselect=”resetStyle(this);” />