ascend 2/can't move apps to sd card???

hi, I'm new here. Nice to meet you all. :hello:

So I have an ascend 2 and for some odd reason I can't move the majority of my apps to my sd card. The option is there but it is blocked out. I have no storage on my phone an like 3 gigs left on my sd card!! what is going on here? Someone told me it could be because I have all the free versions of the apps?

Help is really appreciated!!