CSU and UC Psychology Impacted, need to pick another major

Hi,
I’ve run into a hump, I’m trying to turn in my apps into CSU schools but since Psychology is an impacted program, the site is asking me to make a 2nd choice. I entered Sociology but it rejected it, since you can’t put 2 impacted programs, I’m not sure if I should chose undeclared.

Also I’m hearing it’s the same for the UC apps? is this true?

I need help!