The option it seems you wanna pick is "You smiled, seeing your body. You were confident and happy with how it looked." I tested it out and that one, as well as one at the bottom about being neutral towards your body both don't give you the line about being trans, and I assume this is the case with the one that explicitly mentions being cis as well though I didn't bother testing.
So basically, it seems to be, if the option mentions hormones and/or surgery your character will be trans if not they'll be cis.