Is checking "undecided engineering" a bad idea?

Hey, I’m about to submit my UW Engineering Scholarship App, but I’m not sure whether I should check “undecided” or not. I’m strongly leaning towards civil or mechanical, but I haven’t for sure decided which one. Would it be in my best interest to pick one of those two rather than mark undecided? Or does it not make a difference?

Update: I ended up picking one