What Web browser-based security vulnerability was exploited to compromise the user?

While performing online banking using a Web browser, a user receives an email that contains a link to an interesting Web site. When the user clicks on the link, another Web browser session starts and displays a video of cats playing a piano. The next business day, the user receives what looks like an email from his bank, indicating that his bank account has been accessed from a foreign country. The email asks the user to call his bank and verify the authorization of a funds transfer that took place.

What Web browser-based security vulnerability was exploited to compromise the user?
A . Clickjacking
B . Cross-Site Scripting
C . Cross-Site Request Forgery
D . Web form input validation

Answer: C