French language Q&A Forum

I didn't know what else to title my question/issue around this particular subject, but it seems that there's a lack of consistency even here on Kwiziq concerning this subject, evident because of the questions & answers here. There's a "fill-in-the-blanks" exercice that I just revisited titled "Voyage autour du monde" (https://progress.lawlessfrench.com/my-languages/french/tests/overview/1544705) that has two answers which contradict the lesson and feedback.

"Je visiterais d'abord la Californie, puis j'irais en Arizona." According to the lesson, and feedback the correct responses should be "Je visiterais d'abord en Californie, puis j'irais dans l'Arizona." 

Ergo: Confusion Leads to Confusion. 

I am finding these extremely difficult, for some reason, despite doing a lot of wotk on ce que / que etc. It would be helpful if you could find some way of explaining why the wrong answers are wrong.