I guess technically Option A is accurate. I was born in Colorado and was, as far as the IRS is concerned, a Colorado resident until 2014 (went to graduate school in Idaho, and then worked seasonal jobs in Oregon, Washington, and Wyoming before finally getting a "grown-up" job in Seattle).
So, if I were to move
back to Colorado, would I still be considered a native, having been a Washington state resident for 7 years?
Honestly, though, I think probationary "Coloradoan" status is attained when one (pay attention Texans/Californians/Midwesterners) realizes that you don't have to slam on your brakes every time the road slightly curves on a mountain pass and/or drive 10mph under the speed limit.
Most things worth doing are difficult, dangerous, expensive, or all three.