Bessie I've only grown two of those on your list.
It's not Blizzard.
20th Ave & Baker Rd. is a tall plant with light green foliage and bloom is similar but has more petals so a possibility, but doubtful
Googling the ones I haven't grown - Dave's Glacier looks like it has a blush, so no. Mt. Hood is larger (5"), so no. Ferncliff Pearl is possible, supposed to have dark green foliage. 20th Ave Tradition is a ball and supposed to have a blush so no. Hillcrest Amour is supposed to have a blush, so no. Center court is larger (6"+), so no.
If the plant has dark green foliage, I would guess Ferncliff Pearl.
If the plant is tall with light green foliage, I would guess 20th Ave & Baker Rd.
Edit: After looking at a few more photos it looks like Ferncliff Pearl has more pointed florets than yours.
So, I have no clue. But is was fun looking at white cut dahlias.🙂