Why is it taking so long?

In November I applied to UCF in December I found out I was deferred and in Febuary I sent everything they wanted me to send which was my latest test scores and more recommendations. It is now April and I have not recieved any notification about me being rejected or not. I called and they said it was still with admissions committee and there is no set time to when they will make a decision. Why would it be taking so long for them to make a decision?