You should answer with what type of connection you pay your ISP to provide you with. For example, if you use wifi to connect to your wireless router, but it uses ADSL to connect with the ISP, you should choose "ADSL". Similarly, if it's a cable wireless modem, choose "Cable modem". (In fact, there is no wifi option for this reason; see below.)
One note - FWA stands for Fixed Wireless Access, otherwise known as a Wireless local loop (and other names; see the link for details). It generally does *not* refer to wifi; rather, it means that your router itself uses a wireless connection to communicate with a nearby station belonging to your phone company.
In some rare cases, an ISP itself might provide wifi directly, rather than your router; if that's so, choose FWA. In all other cases, don't. :)
On to the poll!
What method do you use to connect your computer/router to the Internet?
FWA (Fixed Wireless Access; generally not wifi)
Other (explain in comments)
I don't know