how do i sync my iphone with itunes on windows 8?

I have Windows 8 and I cannot sync my iphone 5 to my itunes.

When I open Itunes, I go to File > Devices > but i cannot select the Sync options.

I don't know why.

I am thinking it is because i am using Windows 8. however I have checked my updates, and itunes says i'm currently upated with itunes (11.0.4)

Please help!!! it's really frustrating because i want the music on my itunes to go on my iphone!!

Thank you!!